Coloradans among plaintiffs in suit accusing big airlines of price collusion

Airline customers — including two Coloradans — filed a lawsuit in Dallas today against four major airlines, citing antitrust law violations and airfare inflation. The plaintiffs said they will seek class-action status for the suit. United Airlines (NYSE: UAL) and Southwest Airlines (NYSE: LUV) — the two biggest carriers operating at Denver International Airport — along with American Airlines (Nasdaq: AAL) and Delta Air Lines (NYSE: DAL) are named in the suits, which accuse the carriers…