Table:
text: Toledo Express Airport
History
Passenger air service history
Airline Destinations Aircraft_Scheduled Service_Dates Comments_
Mesaba Aviation Detroit, Youngstown Dash 8-200, Fokker 27, Metro III, Saab 340  Original and dba Northwest Airlink
Piedmont Airlines Dayton Boeing 727-200, Boeing 737-200  Merged with USAir
TransMeridian Airlines Las Vegas, Sanford/Orlando Boeing 757-200, Boeing 727-200, MD-80  Filed for Bankruptcy
Trans Midwest Airlines Columbus, Dayton, Detroit Metro, Lima Piper Navajo 1983-1985 
Trans World Airlines St. Louis Boeing 727-100, DC-9, Martin 404  
United Airlines Chicago O`Hare, Cleveland, Denver, Fort Wayne, Peoria, Saginaw DC-8 series 21, Boeing 727-122, 727-222, Boeing 737-222,Caravelle, Boeing 720, Convair 340, DC-6B  
US Airways (USAir/Allegheny) Pittsburgh Convair 580, Boeing 727-200, MD-80, Boeing 737-200/300/400, DC-9-30, BAe 1-11, Fokker 100, Fokker 28

Question: Which is the only airline to have "filed for bankruptcy," according to a comment from Toledo Express Airport?