Originally Posted by
Una Due Tfc
There's a few nerdy ones out there. The BA LHR-SEA flight is BAW5EA (5 looking like an "S"), so the flight ident looks like it's spelling SEA on the radar screen.
Which wouldn't mean anything to ATC since the flightplan says KSEA.
I don't really know why IATA codes are still used for anything these days, what with 'controlled duplicates' and others that bear no resemblance to the airline or airport name. Just scrap them.