RAF York Squadrons.
No. 24
No. 40
No. 51
No. 59
No. 99
No. 206
No. 232
No. 242
No. 246
No. 511
Looking through an old copy of "Aeroplane" it identifies a number of York codes,
51 Sqd, MW271, TB-X to 242 Sqd, KY-P
242 Sqd, MW232, KY-M to 511 Sqd, as "AJ"
242 Sqd, MW105, KY-T to 1332 Sqd (Heavy Transport Conversion Unit), YY-A
? Sqd, MW302, "AK"
A feature on many of the aircraft is two white letters on a black background on the nose. The first letter identifying the squadron and the second the aircraft eg KY-M would become KM.