Trying to track some TUI UK (formerly Thomson) flights, but they only appear to be recorded under their filed ATC callsign, rather than the flight number.
For example – TOM5504 (STN-CFU) operated yesterday – the last recorded data under the flight number is for October 2018, but yesterday’s flight is recorded – under TOM30Y:
(It’s not an IATA vs ICAO issue, as far as I can tell: neither TOM5504 nor BY5504 return anything, only TOM30Y).
This seems to be the case for most TOM flights I’ve tried recently. Have we lost the ability to look up based on flight number rather than (presumably ADS-B transmitted) callsign?