Military jets safely escort NYC, Detroit flights

By DAVID N. GOODMAN and JAMES ANDERSON and TOM HAYS | September 12, 2011 | 3:15 AM EDT

This photo provided by Joey Mentzer, passengers are escorted off an Frontier Airlines plane on Sunday, Sept. 11, 2011 at Detroit's Metropolitan Airport. Police detained three passengers in Detroit after the crew of the Frontier Airlines flight from Denver reported suspicious activity on board and NORAD officials sent two F-16 jets to shadow the flight until it landed safely, the airline and federal officials said. Frontier Flight 623, with 116 passengers on board, landed without incident in Detroit after the crew reported that two people were spending "an extraordinarily long time" in a bathroom, Frontier spokesman Peter Kowalchuck said. (AP Photo/Joey Mentzer)

NEW YORK (AP) — Authorities say fighter jets escorted two commercial flights into New York City and Detroit "out of an abundance of caution" on the 10th anniversary of the Sept. 11 terrorist attacks.

The bathroom use by some passengers aroused the suspicion Sunday. No arrests were made.

On an American Airlines flight from Los Angeles, three passengers who made repeated bathroom trips were cleared after the plane safely landed at New York's Kennedy Airport.

On a Frontier Airlines flight from Denver to Detroit, the crew noticed two people spending an excessive amount of time in a bathroom. Police detained three passengers at Detroit's Metropolitan Airport. They also were eventually released.

New York, in particular, has been in a heightened state of security after federal officials received a tip of a car bomb threat.