airbus 320 has some mini winglet, when the 737 has none except for the NG which has big winglet.
and the 737 has a small window above the pilots.
this is what bug me, some pilots have no clue how to recognise aircrafts.Dont they teach you that in your flight schools??.
you should make the difference between a twin turboprop like king air, a small jet like the citation, and know the difference between fokker, airbus, boeing....and know how jet fighters look like(tornado, falcon 15-18, mirage, rafale,...)in case you are intercepted.