Copaair clarified some things, though I have one correction to make first of all. Neither Avianca nor Sam operate F-27, they only operate Fokker 50.
When Avianca, Sam and Aces merged as Summa Alliance, they operated at one point 8 A320 in intra-colombian routes and some international legs aswell. When ACES stopped operations, they withdraw all their A320 and ATR-42 also. Currently AV
covers with 757 and MD
-80 the routes that ACES formerly operated with A320, such as BOG
Right now, as posted before, Avianca operates Fokker 50 in regional and some domestic services, MD
-80 and 757 on domestic routes, and 757, 767-200 and 767-300 on international operations from their hub in BOG
and from other cities aswell. No A320 currently.