The Treasury Department said Thursday that it had signed letters of intent for new loans to American, Spirit Airlines, Frontier Airlines, Hawaiian Airlines and SkyWest Airlines.
American Airlines said it signed a term sheet with Treasury for a $4.75 billion loan, which would be in addition to $5.8 billion that Treasury has already agreed to extend to American.
Major carriers including American, United, Delta and Southwest have raised billions in available cash on the private credit market.
Some, including United Airlines, have said they would apply for loans but might not use them.
Shares of American Airlines and its three closest competitors Delta, United and Southwest ranged from down 1% to up 1% in midday trading.