Historical aircraft types

REG	type	ICAO
N508DA	A21N	a657f4
N504DZ	A21N	a6492f
N502DX		a641bf
N507DZ	A21N	a65454
N549DN	A21N	a6f9b3
N511DE	A21N	a66576
N545DE	A21N	a6eacf