I did my selection tests in 2000,so my information may not be current. On the first selection day there were no aircraft recognition tests. On the 2nd stage, during the "technical interview" part of the day,my interviewer produced about half a dozen small model aircraft and asked me to identify them. I got the obvious-Concorde,B747,and a DC10 i think. The rest were of the B737,A320 size of aircraft and I had to admit that I didn't know the difference! If you have done well in the rest of the application process then not knowing the difference between an A320 and a B737 will not harm you at all.Good luck.