Iran closed its airspace temporarily to most flights late Wednesday, forcing airlines to cancel, reroute or delay some flights, amid concerns about possible military action between the United States and Iran.

Iran said in a notice posted by the U.S. Federal Aviation Administration that it had closed its airspace to all flights except international ones to ?and from Iran with official permission at 5:15 p.m. Eastern Time.

The prohibition was set to last ?for more than two hours, until an estimated 7:30 p.m. ET, but it was later extended until an estimated 10:30 p.m. ET.