Historical aircraft types

REG	type	ICAO
N550DN	A21N	a6ffc3
N538DN	A21N	a6ce7d
N525DA	A21N	a69bcd
N582DN	A21N	a77dae
N546DN	A21N	a6ee8e
N543DE	A21N	a6e361
N532DN	A21N	a6b833