Historical aircraft types

REG	type	ICAO
N535DN	A21N	a6c358
N592DT	A21N	a7a532
N543DE	A21N	a6e361
N521DT	A21N	a68d02
N509DT	A21N	a65bbc
N529DT		a6aaba
N527DE	A21N	a6a33f