Historical aircraft types

REG	type	ICAO
N37506	B39M	a448d5
N37534		a4493c
N77537	B738	aa7e7b
N452UA	A320	a57b4d
N76269	B738	aa4c42
N437UA	A320	a53ee2
N37274	B738	a43ea3
N471UA	A320	a5c694
N66808	B739	a8d46a
N431UA	A320	a52898
N14249	B738	a0ad24
N470UA	A320	a5c2dd