It might seem like flight crews are just being polite when they say hello and welcome you onboard.

But there’s actually a very serious reason that flight attendants say hello to every single passenger without fail as they hop on board a plane, according to an air hostess who jumped onto Tiktok to reveal a little known airline secret.

The crew member, Iona Iachim, posted to her social media to reveal the truth behind the greeting on each flight.

Iona, who works for budget airline Wizz Air,…