This is all you need to do to get an upgrade on a plane, according to flight attendants

Hollywood makes it look so easy. You just swan up to the check-in looking winsome and - ta da! - you've been upgraded to first class.

Unfortunately, this rarely corresponds with reality.

But what if there was something you could do - and it was in fact just a simple tweak to your normal booking process?

Apparently such a tweak exists, and someone's even done the field research to get it.
Fed up of constant rebuttals and no success, writing for Cosmopolitan , Catriona Harvey-Jenner stuck her neck out for holiday-goers everywhere and asked the question we're all dying to know the answer to.

IS there one sure-fire way of getting an upgrade to first class?

On a flight a trip on British Airways' new flight route from London Heathrow to San Jose, Catriona "decided to corner the flight attendants and find out how it actually works."

Not only was there an answer, but it doesn't require a super-human amount of effort - and it's something we should be doing at either the booking or checking-in stage.

Even if Catriona has yet to try it out, it seems plausible.

Apparently all you do is NOT pre-select a seat when you check in online before your flight (or when you book).

Of course, there are variables, such as if the flight's full.

But the reasoning is that if you already have an allocated seat, the airline see you as being sorted out for your journey.

If you don't, there's a chance they could bump you up to first or business class if there are empty seats there.

A cheeky upgrade would be the icing on the cake.