when did they close?

Back in the day, US Air (before the "Airways") had quite a few res centers, inherited from the pre PI merger days. IIRC: SYR, UCA, BNA, WAS, DAY, IND, INT, RNO, SAN, PIT. HP: RNO. PHX Starting in the early 90s, they started to close. Does anyone remember the dates of the closures? What is...