Fighter jets were scrambled to escort two commercial flights into New York City and Detroit "out of an abundance of caution" after crews reported suspicious activity on the 10th anniversary of the Sept. 11 terrorist attacks, officials said.
The bathroom use by some passengers aroused the suspicion Sunday, but all were released after being questioned by authorities on the ground.
On an American Airlines flight from Los Angeles, three passengers who made repeated trips to the bathroom were cleared after the plane safely landed at New York's Kennedy Airport.
Earlier, on a Denver-to-Detroit Frontier Airlines flight, the crew reported that two people were spending "an extraordinarily long time" in a bathroom, Frontier spokesman Peter Kowalchuck said. Police detained three passengers at Detroit's Metropolitan Airport, but they also were eventually released.
Asked late Sunday if authorities may have overreacted, airport spokesman Scott Wintner said the airport's response wasn't unusual and the same steps would have been taken any other day of the year.