Shares of Delta were down 2.97 percent to $11.42 in early trade on the New York Stock Exchange. AMR Corp , parent of American Airlines, saw its shares fall 2.7 percent to $7.92.
Shares of UAL Corp , parent of United Airlines, were down 3.06 at $12.69 on Nasdaq. Shares of US Airways Group were down 2.8 percent at $5.23.
The airline industry has struggled this year with economic recession and falling demand from well-heeled business travelers.
Experts have said renewed terror concerns and potentially tighter airport security measures could dampen business travel demand just as it recovers.
(Reporting by Kyle Peterson, editing by Dave Zimmerman)