A traveller has claimed the BA pilot had to help out with the safety demonstration, which large takes place as the plane is taxiing along the tarmac.
The 747 exit was taking off from Houston in Texas, United States, headed for London Heathrow.
Jo Osborn was one of the voyagers on the 10-hour journey and decided to tweet about her unusual experience.
Jo annulled: “’We’re short of crew today so the pilot is helping with the shelter demo’.
Want me to do it @British_Airways, so he can fly the plane?”
BA took to Twitter to answer to Jo personally, with staff member Lolly writing: “We normally be suffering with two pilots on each flight, Jo. Hope this clarifies matters.”
Jo hit past due, commenting: “Thanks Lolly – I knew that – it was a first to see – he did a great job pointing out the quits though…”
Another person entered the Twitter debate, writing: “All BA flats need two pilot minimum in the flight deck. Also all demo establishes must be covered…”
One Twitter user wrote: “omg [sic] this is so embarrassing”.
The UK airline is investigating the fare’s claims but insists there were enough staff on board the aircraft.
A BA spokesperson said: “We would never operate a flight without the adequate numbers of fully trained pilots and cabin crew.
“The Houston light out had three pilots and 13 cabin crew on board.
“Our cabin party and pilots always work as a team to ensure the safety of our customers.”
The voyager’s claim came in the midst of a week-long strike by BA Mixed Fleet lodge crew over wages.
It followed months of strike action by the crew, organised by the Unite union.
A four-day strike was carried out from February 22, as joint members vowed to “pile on the pressure” over what they invite “poverty pay”.
The two sides have clashed over rates, with Wed saying the cabin crew earn an average of £16,000 a year, covering allowances, but BA insisting no one was paid below £21,000.