Sabre on Friday rejected American Airlines' claims that the GDS operator's new airline shopping display biases against the carrier and breaches their contract. In their court filings in Tarrant County, Texas, the parties offered contradictory commentary and argued about the nuances of their agreement. The bigger picture, though, is one of airlines and distributors at odds over how to sell ancillary products and services, and how to fairly display airline offers. The legal wrangling is yet another demonstration of how far the industry is from harmony . . .