It’s simple economics: when airlines drop fares, they get plenty ofpassengers. Saint Louis-based T-W-A reports it set several all-time boardingrecords in Des Moines last month.T-W-A spokesman Jim Brown says the airline boarded more than 16-thousandpassengers during March, its best month since at least 1978, the year ofairline deregulation. Brown says the airline tries to deliver service.All of the major carriers dropped fares significantly on many flights afterDes Moines-based AccessAir took off in February. Brown says T-W-A welcomesthe competition.Brown says T-W-A also set a one-day record on March 18th, welcoming 822passengers to Des Moines and leaving only one seat open for the entire day.