Allegiant Air (Allegiant Travel Company) (Las Vegas) reported its first quarter net income increased 191.2 percent to $28.2 million from $9.7 million a year ago. This translates to a 31.3 percent operating profit. Clearly Allegiant is one of the most profitable U.S. airlines and has found a very successful niche. The company has also raised its fleet to 41 McDonnell Douglas DC-9-82/83/87s.