Delta Airlines

Courtesy of Port of Seattle

Can two airlines be partners and rivals at the same time? Seattle-based Alaska Airlines and Delta Air Lines are long-term contractual allies. But now the relationship is being tested.

Ted S. Warren / AP Photo

The parent company of Alaska Airlines and Horizon Air announced strong earnings for the first quarter of the year on Friday.

The airline group's CEO said he expects good results for the rest of 2014 as well, notwithstanding growing competition from Delta Air Lines on Alaska's home turf. Delta is dramatically ramping up its Seattle operations to build a new hub city oriented toward the Pacific Rim.