"some bankrupt airlines list"
United - 2002
US Airways - 2004
Northwest - 2005
Delta - 2005
Frontier - 2008
American - 2011
the combined pressures of 9-11-2001 and the financial crisis/recession of 2007-2009 probably did the later guys in
to be clear, ALL Big-3 players filed bankruptcy, in the years post 9-11