There's nothing worse than arriving at the airport, ready for your holiday, only to find out that your flight has been delayed.
You're probably already sleep deprived, you've stressed yourself out triple checking your passports, boarding passes, travel insurance and hotel confirmation - and now this.
And as the hours tick by, and you're still not able to board your flight, the feeling of frustration only gets worse.
But help could be just one photo away with a new app, that can tell you how much compensation you're entitled to when your plane has been delayed.
All you have to do, is take one picture of your boarding pass, upload it to the AirHelp app and find out instantly whether you're owed money.
If your flight is delayed for three hours or more, and the flight distance is less than 1,500km, you could be entitled to €250 (£219) in compensation.
If your flight is delayed by four hours or more, and the flight distance is more than 3,500km between and EU and non EU airport, you could claim back €600 (£527).
On average, customers claim £353 or more back in compensation by using the app, even if they have been offered free food and drink vouchers by the airline.
See also: Is this Britain's least punctual plane?
On their website, Air Help say: "We fight for millions of travellers who are unsure of their rights, lack the time, or lack the expertise to embark on the claims process independently.
"We believe that air passenger rights weren't made for airlines to interpret on a whim.
"That's why we've made it our job to hold the airlines to their financial obligations. We fight back in court, through national enforcement bodies, and online - by exposing the airlines' ineptitude for properly informing passengers of their rights.
"Our goal is to make claiming compensation as easy and seamless as possible."
According to the Citizens Advice Bureau , if your flight is delayed for two hours or more, your airline has to give you food and drink, access to calls and emails and accommodation if you're delayed overnight, including journeys to and from the hotel.
If your flight is delayed for three hours or more, you'll also be entitled to compensation if the delay is the responsibility of the airline.
But this won't apply if the delay is due to bad weather or a strike.
If your flight is delayed by five hours or more, the airline legally has to offer you a full refund for the flight and any onward or return flights that you will no longer be able to use.
You should also be given a free flight to the airport you departed from, if you have more than one leg of your journey.
If you end up taking the flight, you can claim up to €600 in compensation, but again, only if the delay is the fault of the airline, for example overbooking or technical issues.
Visit the Citizens Advice Bureau for more information.
What to do if your flight is delayed
- Keep hold of your boarding pass
- Ask a member of staff why the flight is delayed
- Make a note of the actual arrival time at your final destination
- Ask the airline to cover food and drink costs
- Don't sign anything or accept offers that may waive your rights
- Choose to wait, or call it off if your delay is more than five hours
- Get the airline to provide you with accommodation at a hotel
- Keep any receipts if the delay costs you any extra money
- Find out if you are entitled to compensation - and claim your money back