Ryanair shared the mistake passengers make and it's causing a stir. The airline is known for low fares.

Ryanair was started in 1985 by Christopher Ryan and Tony Ryan. Today, it has over 600 planes.

Ryanair operates 3,500 flights a day to 230 airports in 40 countries.

Ryanair posted a video on TikTok about a common travel mistake. The mistake is packing large suitcases.

Ryanair allows one small bag per person that fits under the seat.

Ryanair offers extra baggage options like priority boarding and checked bags.

Infants have no cabin baggage allowance but can bring a 5kg baby bag.

Some passengers don't check their bag size. A TikTok video showed a man with a large bag.

The man in the video was told his bag was too big. He was called an average Ryanair passenger.

The video showed excuses passengers give to Ryanair staff. Excuses include 'it fit at home' and 'this is unfair'.

The video has been viewed 245,900 times and has many comments. One user said it's like passengers' first time flying.

Some users joked about what bag to bring. Ryanair replied that oversized bags will be charged.

Someone asked if paying extra makes the bag smaller. The answer is no.

One person said they can carry two bags per person. Another joked about traveling by unicorn.

Ryanair is based in Ireland and is the largest airline in the world. It has a large fleet of planes.

Ryanair has 613 planes, including 26 leased aircraft.

Most of Ryanair's planes are Boeing 737s. The 737-8-200 was designed for Ryanair to carry more passengers.