LEAD: Braniff Inc., the nation's 15th-largest airline, filed for bankruptcy protection yesterday, caught between the high cost of an aggressive expansion and the difficulty of securing financing in a troubled ''junk bond'' market. http://query.nytimes.com/gst/fullpage.html?res=950DE0D9103DF93AA1575AC0A96F948260
OK, got it......put UNITED, AMERICAN, or USAIR in the place of Braniff and then we will be very close to the current situation.