After the September 11 attacks , Avianca , the regional carrier SAM Colombia , and its major rival ACES Colombia joined efforts to create Alianza Summa , which began merged operations on 20 May 2002 . In November 2003 , Alianza Summa was disbanded and ACES Colombia was liquidated altogether and SAM Colombia was acquired to be a regional carrier under Avianca 's brand
September 11 attacks
September 11 attacks
Avianca