American Airlines CEO and two of the airline's unions are speaking out against Qatar Airways' bid to invest in the airline.
Qatar Airways says it wants to buy 10% of American Airlines. American Airlines pilots say the effort 'has got to be stopped.'
Qatar Airways battles American Airlines on subsidies to Middle East carriers, but it also owns big shares of American partners British Airways and LATAM.
American, Delta and United are all having strong years, but Southwest is the only airline whose share price gain exceeds the S&P 500.