Historical aircraft types

REG	type	ICAO
N520DE		a6893e
N526DE	A21N	a69f88
N585DN	A21N	a788d3
N550DN	A21N	a6ffc3
N532DN	A21N	a6b833
N533DT	A21N	a6bbef
N539DN	A21N	a6d234