Many planes cannot fly. The planes are called Airbus A320. There are 6,000 of these planes. They have a problem with their computer.
People found the problem after a flight in October. Strong sun can hurt the plane's computer. This is not safe. So, all the planes must stay on the ground.
This is a big problem for many people. Many people want to fly for a holiday. Now, their trips are late or cancelled.
It is easy to fix new planes. It takes three hours. But old planes are difficult to fix. They need a new computer. This takes a long time.
Airbus says they are sorry. They are working to fix all the planes.