The no-fly announcement rattled regional nerves as it followed shortly after China staged new war games around Taiwan, which Beijing views as sovereign Chinese territory.
The decision could transform Ben Gurion Airport into a global transit hub between Asia and Europe.
An unconfirmed media report said an unidentified object had been spotted in the sky and fighter jets were dispatched to investigate.
That move shortens the distance to Asia by two hours. It makes India, in particular, much more accessible.
“I'll let the intel community and the counterintelligence community figure that out. I haven't ruled out anything,” said General Glen VanHerck.