Historical aircraft types

REG	type	ICAO
N541DE	A21N	a6dbf3
N525DA	A21N	a69bcd
N546DN	A21N	a6ee8e
N543DE	A21N	a6e361
N504DZ	A21N	a6492f
N545DE	A21N	a6eacf
N540DE	A21N	a6d83c