At about 21:09 on Sunday 27 September 2026, an aircraft crossed the little radar on my desk at 32,000 feet. The label read Boeing 777-200LR, registration A7-BFH, flying as QTR8836, with the route LGG→ORD: Liège to Chicago. Earlier that day another one had gone over at 34,000 feet, N773CK, flying as CKS264, labelled Boeing 777-200LR as well.

Neither of them is a 777-200LR. A7-BFH is a Qatar Airways Cargo 777 freighter, and N773CK is a 777F operated by Kalitta Air in DHL colours. The FAA register lists N773CK's model as "777F", built in 2020. The screen wasn't wrong so much as faithfully repeating a quirk that every flight tracker shares.

One code, two aircraft

Every aircraft type has a four-letter designator issued by ICAO, the UN's civil aviation agency, and published in its Doc 8643 list. It's the code air traffic control sees in a flight plan: A320 for the Airbus A320, B738 for the Boeing 737-800, and so on.

When Boeing launched the 777 Freighter in May 2005, it said it had "selected the 777-200LR Worldliner as the platform". The freighter first flew from Paine Field on 14 July 2008, and Air France took the first one in February 2009. Because it is built on the long-range 777, ICAO's list puts it under the same designator as the passenger 777-200LR: B77L.

The passenger 777-200LR was a niche aircraft. It first flew on 8 March 2005, and in November that year one flew from Hong Kong to London the long way round, east over the Pacific and the Atlantic, in 22 hours 42 minutes, a distance record for an airliner at the time. Only 61 were delivered.

How the name gets on the screen

An aircraft's ADS-B broadcast carries its position, altitude and callsign, but not its type. Trackers fill that in from a database keyed on the aircraft's unique transponder address, which stores the registration and the ICAO type code. The code is then turned into a readable name, and in the databases the community trackers use, B77L maps to a single name: Boeing 777-200LR.

So every 777F anywhere in the world shows up on a tracker as a 777-200LR. When I checked airplanes.live on the morning of 29 September, N773CK was airborne again with the type B77L and the description "Boeing 777-200LR". Of the B77L aircraft in the air at that moment, most were flying under cargo callsigns.

Not just the 777

The same thing happens with 747 freighters. The 747-8F shares B748 with the passenger 747-8, and a 747-400 freighter is simply B744, like any other 747-400. That's why, the same day, my screen showed Cargolux's 747-8 freighter LX-VCD as a Boeing 747-8, and Atlas Air's 747-400 freighter N451PA as a Boeing 747-400. The coming 777-8F will share B778 with the passenger 777-8, so the pattern will carry on.

The fix is simple enough: if a tracker says 777-200LR, check the operator and look for windows. More often than you would expect, it's cargo.

Sources