New Reagan Nat'l carriers hope to land market share.(Reagan National Airport)(Brief Article)

Marketing and ad campaigns are taking flight for the several airlines that won slots for 24 new flights in July at Reagan National Airport.

Their campaigns aren't necessarily unusual -- after all, it's natural for a carrier to shine a light on itself when it begins serving a new market.

"It's business as usual, because it's a competitive business," says Mark Treadaway, air-service development manager at the Metropolitan Washington Airports Authority.

But each airline debuting new service at National faces a different challenge: Some are up against the big boys, the established players. Others are competing mainly against other young airlines. Even …