Cabin crew have been giving the stickers to children but some passengers noticed that boys were receiving stickers saying “Future Pilot” while girls were getting ones saying “Future Cabin Crew”.

Gillian Morgan was one of the passengers to notice how the crew was distributing these stickers along gender lines and called it “deeply sexist”.

“The stickers were gender neutral but it’s the way that they were handed out that makes it complicated,’ Morgan told Metro.co.uk.

Other Tui passengers have also taken to Twitter this summer to criticise the airline for how it has been giving out the stickers to children.

Linzi Williams said in a Tweet: “Lovely touch by @tuiuk flying out to Corfu Friday by giving children Tui stickers and activity sheet.... not so lovely that all the boys were given “future pilot” stickers and the girls “future cabin crew”.”

Tui said in a statement: “We’re sorry to hear a small number of customers have been upset by this.

“We think it has just been a simple mix-up since our future pilot and cabin crew stickers are designed for use for any child regardless of gender.

“The stickers are part of our activity packs which are intended to be used by crew to interact, engage with and create special moments for our customers on their holiday.

“The feedback we’ve had so far this summer has been overwhelmingly positive.”