Flights were suspended at Germany’s Hamburg Airport on Monday over fears a plane with 198 passengers from the Iranian capital Tehran would be attacked.
German police descended on the aircraft when it landed to conduct a search, acting on an earlier emailed threat.
The major airport said on its website that take-offs or landings had been halted due to police measures.
The German Press Agency quoted a spokesman saying that flights had been suspended at 12:20pm local time due to a threat of attack.
Operations resumed about an hour and a half later, though the airport warned on its website that delays were still possible.
A federal police spokesperson told Reuters the measures, which included interviewed passengers and 16 crew, as normal procedure when a threat is classified as serious.
It came amid growing international tensions after Israel came under a sustained and brutal attack by Hamas gunmen.
Hundreds of Israelis were left dead-including revellers at a festival on Saturday.
Israel responded with a wave of deadly retaliatory air strikes on the Gaza Strip.
It came on the first day a special meeting of the German and French governments in Hamburg, with Chancellor Olaf Scholz and President Emmanuel Macron both attending.