Two of the biggest airlines in the USÔÇöUnited Airlines and US AirwaysÔÇöare in talks over a possible merger, according to reports. The companies are said to have been in discussions for two weeks, but as yet, no agreement has been reached. The talks were first reported in the New York Times. Chicago-based United is the third-largest airline in the US by traffic, and Tempe, Arizona-based US Airways is the sixth.