American Airlines on Thursday said it recently received an unsolicited offer from Qatar Airways about its intention to acquire at least a 10 percent stake in American.

American said Thursday it will respond “in due course” with the appropriate filings required under the Hart-Scott-Rodino (HSR) Act.

Shares of American Airlines jumped nearly 5 percent on the statement.

Meanwhile, other airline stocks also climbed higher following this announcement.

This is breaking news. Please check back for updates.