Air battle between US and Gulf carriers heats up

U.S. Airlines Claim to Document Subsidies at Gulf Rivals

Delta hired gumshoes to find back call for Open Skies treaty revisions
 

U.S. airlines are pressing the U.S. to revise open skies agreements with Emirates Airline, Etihad Airways and Qatar Airways, claiming to have found documents that support claims the trio have received unfair benefits and subsidies. 

As the battle intensifies over U.S. airlines' allegations of unfair state subsidies to three Persian Gulf rivals, a look at how the American carriers gathered data to support their claims sheds light on the vast financial reporting divide between the two sides.