Manchester Airport had to evacuate passengers from Terminal 1 on Wednesday morning to carry out investigations on a suspicious bag.
In a statement, the airport said: "At 10:20 today (Wednesday 21st September), Terminal 1 departures at Manchester Airport was evacuated while a suspicious bag was investigated at the main security search area by Greater Manchester Police.
"An evacuation is a standard precautionary measure while the investigation is completed to ensure the safety of our passengers and staff.
"Disruption to the 11 flights departing from Terminal 1 is possible this morning while we resolve the situation. Passengers travelling from Terminal 1 are advised to come to the airport as planned. Arriving flights are not affected. Terminals 2 and 3 are operating normally. We would like to thank all our passengers and staff for their patience during this disruption."
The airport added that at 12.10pm on Wednesday the all clear was given by Greater Manchester Police.
Around 1,800 passengers were affected as a result of the disruption to the 11 flights.