It pays to be kind.

It’s advice your mother has told you thousands of times — and now an airline is rewarding that behavior.  Customer services reps at UK-based Monarch Airlines can give polite callers upgrades like extra legroom seats and priority checkin, the Independent reports. Monarch flies to more than 30 European cities from five UK-based cities including London and Manchester.

This is part of the airline’s year-long campaign to promote “chivalry, courtesy and respect”.  As the airline’s COO told The Independent: “We are often described as the nicer airline and holiday company and we pride ourselves on this … Our customer services staff are already nice – now they can reward those who are positively nice to them too.”

There’s a catch: The upgrades are limited– an estimated 25 people per week will get them — and they will only be available to people who book over the phone, not online.

Even if you’re not a Monarch customer, the “be kind” mantra is good advice for all customers to follow, experts say. While free upgrades seem to be less frequent these days, there’s one rule you can count on: Being rude probably won’t get you one. “The lucky few who have received an upgrade after requesting one were polite … They didn’t demand one,” writes The Telegraph travel editor Oliver Smith.

And it’s not just the customer service reps you should charm. As one passenger recounts to Skyscanner: “Flying to the US a few years ago, I boarded the plane late (as usual) and there was an old chap sitting down in my seat. The stewardess (who I’d chatted to on the way in) was nearby and heard the guy saying he just wanted to sit next to his wife. I told her I didn’t mind sitting in his seat (it was the row behind I think) and off she went, only to return five minutes later. She asked me to follow her…all the way up to business class!”.