"Is this fake news?" asked Dennis Tajer, spokesman of the Allied Pilots Association, which represents American's pilots and wants trade agreements enforced. "The reaction was you have to be kidding me and why."
On its website, Qatar Airlines said it plans to make an initial investment of at least US$808 million (NZ$110m), or 4.75 per cent in the company, which is the most American Airlines allows without advanced approval from its board. Earlier, the company suggested it would seek as much as a 10 per cent stake.
"Qatar Airways sees a strong investment opportunity in American Airlines," the company said in the statement. "Qatar Airways believes in American Airlines' fundamentals and intends to build a passive position in the company with no involvement in management, operations or governance."
Daniel McKenzie, an American Airlines analyst for the Buckingham Research Group, said in a report that "the investment is somewhat awkward given the US airline industry's allegations of unfair trade practices by Middle Eastern carriers."
But Qatar Airways interest could be seen as a way to strengthen its relationship with a major source of revenue since the United States is Qatar's no. 1 destination and accounts for 8 percent of its overall flying, he wrote.
Tensions in the Persian Gulf could also play a role, analysts said. Qatar has been engaged in a diplomatic fight with next-door neighbour Saudi Arabia, which led Egypt, Bahrain and the United Arab Emirates to cut ties with Doha, the country's capital, over claims it supports of extremist groups.
"They just got blocked from flying to four countries," said Samuel Engle, an aviation consultant and vice president at ICF. "Fourteen per cent of their traffic came from those countries. Even if Qatar is able to repair that, that kind of event is a reminder that there is benefit to having a diversified portfolio."
If Qatar actually invests, time will tell if the bet works out. History is not on the airline's side.
"The history of minority investments in airlines that were strictly financial has not been very positive," Engle said. "There have been few success stories. The minority investment doesn't give you enough control with what your partner is doing. There's not a lot of airlines pursuing that strategy globally."