A plane had to divert from Leeds Bradford Airport to Manchester this morning.
The Jet2 flight to Lanzarote circled around the Yeadon airport before crossing the Pennines at 4,500ft.
Fire crews could be seen waiting for the flight at Manchester Airport.
One FlightRadar member said: "ls217 from LBA to ACE (Lanzarote) suffered bird strike on departure. Declared 7700 emergency squawk. circled to burn off fuel and has just landed at Manchester Airport."
Plane crews setting a squawk of 7700 is used to show the aircraft is dealing with an emergency.
It has been widely reported that a bird had struck the plane's engines, according to scanners used by plane spotters.
One person reported hearing a sound that was "a bit odd" when it flew over.
The Telegraph & Argus has contacted Jet2 for more information.
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