A Ryanair flight from London to City of Derry had to turn back on Sunday night after the captain took ill.
The plane returned to Stansted airport and the runway was closed for about 15 minutes while the man was given medical assistance.
A Ryanair spokeswoman said the flight returned to Stansted after a crew member became ill."Passengers were re-accommodated on another aircraft."
However, the airline would not comment on the member of staff concerned.