Galileo will also acquire the 21 percent share of Apollo now owned by U S Airways for $154 million.
U S Airways said today that it would continue to appeal the board's decision to overturn the previous election.
The partnership with U S Airways began in 2002.
A spokesman for U S Airways declined to comment on the filing.
Shares of U S Airways rose $3.3125, or 7 percent, to $49.8125.
U S Airways recently removed a row of coach seats in each wide-body plane to make room for a new, luxurious business-class service.
U S Airways plans a consumer advisory board to provide advice on the airline's performance.
American and U S Airways say members of their plans will be able to redeem miles for tickets on each other.
U S Airways still offers them on all flights, though a spokesman said the carrier was "taking a very close look at its policy."
Bookings that day on U S Airways already exceed 90 percent.