Heathrow Airport recreates exact departure conditions for autistic passenger

Aaran Stewart, 21, has severe autism and obsessive compulsive disorder.

He doesn't do well with change.

To thrive, the British man requires routine and predictability.

So when he travels — and he needs to, four times a year, to attend Boston Higashi High School, which serves young adults with autism — the more identical the experience the better.

Staff at London's Heathrow Airport pull out all the stops to ensure Stewart receives an identical travel experience each time he flies with them, BBC News reported.

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He is greeted by the same airline staff members. He visits the same shops. He leaves from the same gate. He sits in the same seat.

And because of this incredible customer service, Stewart can travel without panicking.

"Without the procedure we wouldn't be getting on the plane. It has to be carried out absolutely pristinely otherwise we'll end up with a problem," Stewart's mother, Amanda, told Radio 4's You & Yours.

"It's routine-based. If there are any delays he'll think you're going to try to change something which will then panic him. When we get to the gate he'll settle," she said.

"Everything's gone to plan, he'll wait for the bus, we've got the seats we need and we're off!"

Heathrow staff are serious about accessibility.

"Last year we helped over 900,000 passengers with reduced mobility through our airport," Mark Hicks, Head of Passenger Support Services at Heathrow, told The Huffington Post in an email. "We believe the key to providing a good experience is consistently giving passengers genuine choice so that their individual needs are met and they feel in control, giving them confidence over their journey."