Electronic Flight Bag: How Digital Tools Are Replacing Paper in the Cockpit

What Is an Electronic Flight Bag

The Electronic Flight Bag (EFB) is a category of electronic device authorized for use by flight crew to access, display, and process information previously carried in the traditional flight bag — a physical bag of paper documents that pilots brought to every flight. The traditional flight bag contained the aircraft's operating manuals (the Airplane Flight Manual, the Quick Reference Handbook, the Performance Manual), navigational charts, approach plates, company operations manuals, logbooks, and any printed information the crew might need during flight. For long-haul crews operating on complex routes, the paper flight bag could weigh 15–25 kilograms and contain hundreds of documents that needed to be kept current through a continuous cycle of page replacements as regulatory and operational information changed.

The EFB replaces this physical paper library with electronic equivalents displayed on tablet computers, laptop-sized devices, or integrated cockpit displays. An EFB loaded with current navigation charts, approach procedures, aircraft performance data, and company operating procedures provides the same information as the paper flight bag in a fraction of the weight (typically 1–2 kg for a tablet-based EFB) and with the critical advantage that electronic documents can be updated wirelessly, ensuring that crews always have current charts and procedures without the manual page-by-page update process that paper documents required.

The weight reduction benefit of EFBs has proven commercially significant. For a narrowbody aircraft on a short-haul network operating 6–8 sectors per day, replacing a 15 kg paper flight bag per crew member with a 1 kg tablet eliminates approximately 28 kg of weight per flight (two pilots, each with a paper bag). At an average fuel burn rate of approximately 3% of weight for fuel savings on a typical flight, this translates to several hundred kilograms of fuel savings per aircraft per year — a meaningful figure for airlines operating hundreds of aircraft. American Airlines estimated saving over $1.2 million in annual fuel costs when it replaced paper manuals with iPads in 2013; Alaska Airlines reported saving 400,000 gallons of fuel annually from its EFB program.

Beyond weight reduction, the EFB enables information capabilities that paper simply cannot provide. A paper approach plate is a static diagram; an EFB approach plate can be overlaid on a moving map, showing the aircraft's current position relative to the approach path in real time. Paper performance calculations require a pilot to manually interpolate from tables; an EFB performance application takes current weight, temperature, pressure, and runway condition inputs and computes V-speeds, takeoff and landing distances, and engine-out performance in seconds. These capabilities reduce workload and the potential for manual calculation errors, both of which contribute to safety.

EFB Classes: From Portable to Installed

Aviation regulators classify EFBs into categories that determine the approval process, installation requirements, and authorized functions. The FAA and EASA use broadly similar classification systems, though the specific terminology differs.

Class 1 EFBs are purely portable devices — typically consumer tablets or laptops — that bring no modifications to the aircraft and are not mounted in the cockpit. They are powered from a portable battery and stowed during takeoff and landing. Because they are entirely independent of aircraft systems, Class 1 EFBs require only an operational approval (authorization in the airline's Operations Specifications or equivalent) rather than an airworthiness certification. The approval process verifies that the device is used in ways that do not distract the flight crew or create safety hazards. The iPad used by many regional and general aviation pilots to display approach charts falls in the Class 1 category — no aircraft modification is required, and approval for the applications is managed through operational documentation.

Class 2 EFBs are portable devices that are attached to the aircraft through an approved mounting system — a ram mount or yoke mount that holds the device in a consistent position accessible to the flight crew. The mounting system and power supply are aircraft modifications requiring an Supplemental Type Certificate (STC) or equivalent airworthiness approval. Class 2 EFBs can remain in place and powered during all phases of flight, including takeoff and landing. Most commercial airline EFB deployments since the mid-2000s have used Class 2 configurations — tablets mounted on dedicated holders at each crew station, connected to aircraft power and potentially to the aircraft's data network.

Class 3 EFBs are integrated into the aircraft's avionics architecture and connected to aircraft systems data. A Class 3 EFB might receive real-time data from the flight management computer, the weather radar, the engine monitoring system, and the aircraft's communication systems, using this data to provide capabilities that a portable device cannot — such as real-time fuel calculations that update automatically as the aircraft's fuel burns, or performance calculations that pull current weight data directly from the load and trim system rather than requiring the pilot to enter it manually. Class 3 EFBs require full avionics certification as installed avionics.

Core EFB Applications

The value of an EFB is determined by the quality and reliability of its applications. Core EFB applications that have achieved widespread adoption across the commercial airline industry include:

Electronic charts and navigation is the foundational EFB application. Jeppesen (Boeing subsidiary), Navtech (SITA subsidiary), and Lido (Lufthansa Systems) are the major suppliers of electronic aviation chart data formatted for EFB display. Jeppesen Mobile FliteDeck, the most widely deployed commercial EFB chart application, provides worldwide SID (Standard Instrument Departure), STAR (Standard Terminal Arrival Route), and approach procedure charts, airport diagrams, enroute charts, and terrain awareness overlays. Charts are updated on a 28-day AIRAC cycle, with emergency amendments pushed more frequently. The electronic chart database for a worldwide commercial operation runs to several gigabytes; connections to ground WiFi at crew bases allow automatic updates before departure.

Aircraft performance calculations replace the paper performance charts and manual calculations that pilots previously used to determine takeoff speeds (V1, VR, V2), maximum takeoff weight, climb gradients, and landing distances. EFB performance applications accept aircraft type, weight, center of gravity, flap configuration, runway condition, temperature, and wind inputs and compute outputs in seconds. The accuracy advantage is significant: manual chart interpolation in a paper manual can introduce errors of several knots in V-speed calculations; EFB performance software eliminates interpolation error entirely. Lido Performance, Runway Analysis (Boeing), and PACE Perf (Airbus) are among the major performance application providers.

Electronic flight logs and journey logs replace the paper-based recording of fuel figures, flight times, delays, and technical defects that crews traditionally completed manually. Electronic logbooks integrate with dispatch systems to pre-populate flight information, reducing crew data entry, and they interface with airline maintenance systems to transmit technical entries directly to the maintenance control center. Some EFB systems provide digital signatures for journey log entries, creating tamper-evident records that satisfy regulatory requirements.

Document management — providing access to the current versions of all regulatory and company documents — is the application that most directly addresses the original paper flight bag problem. An EFB document management system stores the AFM, QRH, company operations manual, and all associated documents in a searchable, indexed electronic library with version control. When a manual is revised, the update is pushed to all crew devices automatically. The regulatory requirement that crews have current manuals is satisfied by verifying EFB synchronization rather than by manually checking page revision dates.

EFB Connectivity: Ground and Airborne Data

The utility of an EFB increases substantially when it has live data connections — both on the ground (for preflight data loading and document updates) and in flight (for weather updates, datalink messages, and real-time performance monitoring). EFB connectivity architectures vary significantly between airlines and aircraft types, reflecting different technology strategies and the practical constraints of aviation-certified wireless systems.

Ground connectivity is the most straightforward case. At airline maintenance bases and crew reporting points, WiFi networks allow EFBs to synchronize with current chart databases, performance databases, document libraries, and company communication systems before departure. Airlines increasingly use dedicated EFB management servers that track the version status of each EFB in the fleet and push required updates automatically when the device connects. Some airlines use cellular data (4G/5G) as a backup to WiFi, allowing updates to be received during crew transport from the hotel to the airport.

Airborne connectivity for EFBs has two distinct use cases. The first is receiving updated weather information — METAR (surface weather observations), TAF (terminal forecasts), PIREPs (pilot reports), SIGMET (significant meteorological information) — for en route and destination planning. On aircraft with broadband satellite connectivity (Ku-band or Ka-band SATCOM), EFBs can receive updated weather via the aircraft's WiFi network in the same way a passenger's laptop connects to inflight WiFi. On aircraft without broadband connectivity, weather updates are traditionally received via ACARS datalink and displayed in the EFB through an ACARS gateway.

The second airborne connectivity use case is transmitting EFB data back to airline operations. Fuel uplift figures, actual versus planned performance comparisons, and electronic journey log entries can all be transmitted to ground operations in real time, enabling the airline's operational control center to monitor fleet-wide trends without waiting for crew debrief. This "connected EFB" capability is increasingly seen as part of a broader airline digital operations architecture that includes real-time engine monitoring, predictive maintenance alerts, and automated crew communication.

The Paperless Cockpit: Progress and Remaining Challenges

The aspiration of the fully paperless cockpit — a flight deck with no paper documents whatsoever — has been approached but not yet fully achieved in commercial aviation. The primary barriers are regulatory (some documents still require physical paper originals or co-signatures), operational (paper provides a failure-mode backup when EFB devices fail), and institutional (long-established paper-based workflows are difficult to change across an entire airline simultaneously).

Airlines that have achieved the most complete paperless operations include Southwest Airlines, which became the first major US carrier to receive FAA approval for operations using EFBs in lieu of paper manuals; Alaska Airlines, which received approval for paperless operations across its fleet in 2013; and Qatar Airways and Emirates, which have deployed Class 2 EFBs across their entire fleets with regulatory approval for paperless operations. In each case, the regulatory approval required demonstrating that the EFB system had adequate redundancy (two independent EFB devices per crew, with a failure procedure that reverts to stored minimum essential information), adequate update procedures (ensuring currency without relying on paper as backup), and adequate training (ensuring crews could operate effectively with the EFB and manage EFB failures).

Remaining paper in most cockpits includes Minimum Equipment List (MEL) physical records for certain certificate requirements, paper-based oceanic clearance forms in some regions, and paper charts as a backup for certain high-consequence approach procedures. The regulatory evolution toward fully electronic documentation has been gradual, reflecting the conservatism appropriate to systems where failure could have catastrophic consequences. The pace of paper elimination has accelerated since 2015 as EFB reliability has been demonstrated across millions of flight hours, and the remaining paper is increasingly vestigial rather than operationally necessary.