BRITS flying with a popular airline in the UK are being warned they won't be able to check in for their flights.
Hungarian airline Wizz Air has told passengers they will be carrying out a "server upgrade" which will prevent people from checking in online.
It will affect both the website and the app, as well as anyone wanting to search or book flights.
The maintenance will take place tonight from 12am to 8am - affecting anyone flying tomorrow.
A statement explained: "Customers will be unable to search, book or check in online or via the app during this time.
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"Customers will be offered free airport check-in between 12am and 12pm on July 4."
While this will be free, passengers who are travelling with hand luggage only will have to allow extra time in case of queues.
If flying short haul, it is advised to arrive two hours before your flight, with up to three hours for long haul flights.
Airlines often undergo maintenance work which can affect flight check in.
Last year, Ryanair issued a travel warning for Brits who wouldn't be able to check in for nearly 12 hours.
The airline is one of the only ones to charge people to check in at the airport with a £55 fee.
A travel expert has revealed why you should check in as early as possible for your flight.
Scott Keyes, founder of Scott's Cheap Flights, said: "That first-come, first-serve is determined by what time you checked in for your flight.
"So if you check-in for your flight, even five or ten minutes after that 24-hour mark, you're going to likely get put into the B or C-section groups, which means your odds of sitting together as a group or getting an aisle of window seat are not great.
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"Especially if it's a packed flight."
Scott recommends setting an alarm on your phone to notify you of the exact moment that check-in opens for your flight.
There is one reason to never check in online - it could be harming your chances of being upgraded, according to flight attendants.
