American Airlines Group Inc. said Monday that it would use travel-technology company Sabre to develop a single reservations system under American’s merger with US Airways.

Financial terms were not disclosed.

American said that the development of a single reservation system would be a milestone in the process of combining the two airlines, which merged last month but will operate separately — each with its own reservations system — for up to two years.

Shares of Fort Worth-based American fell 12 cents to $30.28 in afternoon trading. Sabre, based in Southlake, Texas, is privately held.

Related: American Airlines Antitrust Settlement Cost Sabre $222 Million

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Photo Credit: Employees check in travelers at the US Airways counters at Philadelphia International Airport. Mark Makela / Reuters