HOLIDAYMAKERS heading abroad this summer should check their boarding pass before heading to the airport.
While having your boarding pass on your phone is much easier, there are a number of destinations where this will cause you problems.
Airports in Turkey, excluding Dalaman Airport, do not accept mobile boarding passes so you will have to print these out.
This is the same for all airports in Morocco as well as Albania's Tirana Airport.
And anyone heading to Egypt, in particular flying through airports in Hurghada, Sharm el Sheikh and Marsa Alam, should also print their boarding passes.
With millions of Brits expected to head abroad to these popular destinations this year, it could result in huge problems at the airport.
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The Ryanair website warns: "We accept mobile boarding passes on flights from the majority of airports on our network.
"However unfortunately some airports cannot accept mobile boarding passes yet, these airports are: Turkey (except Dalaman airport), Morocco and Tirana Airport in Albania.
And easyJet has issued a similar warning for the three destinations, as well as those in Egypt.
The website states: "If you're flying from an airport that doesn't currently accept mobile boarding passes, please check in online at www.easyJet.com and print out a paper boarding pass for your flight."
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Not printing out your boarding pass could even see you charged £55 per person.
Ryanair has some of the strictest rules when it comes to boarding passes.
While they accept mobile boarding passes for most destinations, anyone who fails to get theirs will have to pay £55 at the airport to print one out.
And the codes on your boarding pass could warn you of extra checks or even extra flight problems.
One code is SSSS, which stands for “Secondary Security Screening Selection.”
This means you have been selected for extra checks at security, which can include a pat down, swab and more bag checks.
If you spot this on your pass, make sure to get to airport security with plenty of time to avoid missing your flight.
And if your seat number is 0, it might mean you won't make your flight.
While most people will be able to see any number from 1 up to 40 for seat numbers, 0 means you have not been allocated a seat.
This might mean the flight is overbooked, so could find yourself being bumped to another flight.
Travel Creator James Scoffin told Sun Travel: "They give you a seat allocation of 0 on your boarding pass, which means you have checked in, but not actually been given a seat."
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Make sure you either, as hackers could use the data to access your data and even cancel your flight.
And you shouldn't throw it away as soon as you land - as you could miss out on a number of discounts.