And depending on the codes printed on your boarding pass, you may be in for some bad news.
An Air Canada ticket agent has revealed how the code "GTE" reveals if the flight has been oversold – something most airlines do – and how it might impact passengers who have this on their boarding pass.
He told CBC: "If someone has 'GTE' [for 'gate'] on their boarding pass, it means they don't have a seat."
The unnamed attendant also claimed that he told ticket agents for the airline not to tell passengers as they would get upset – instead, they should send them to the gate.
The revelation comes after an Air Canada employees revealed how they were trained to hide information from passengers regarding their flight ticket and whether they had been given a seat.
The employee explained how he would tell passengers they were getting on the plane, even when he "knew that they might not".
He revealed some of the stories of travellers being "bumped" from flights, such as a couple on a honeymoon together or a family on their first holiday.
Airlines can offer passengers thousands of pounds if they force them from a flight due to being overbooked, with experts warning as many as 150 seats are sold for every 100 seats.
EU regulation stipulates airlines are only required to give up to 600 euros (£526), however.
Sun Online Travel previously revealed how passengers with the code SSSS on their boarding pass could be subject to additional checks at security as it stands for "Secondary Security Screening Selection".
WCHR means the passenger is a wheelchair user while CHML means a child meal has been requested.
Sun Online Travel has contacted Air Canada for comment.
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