There are two types of repairs that happen in the game. There are the regular repairs that you initiate on the Routes Informormation page or on the detailed view of planes on the Airline Information page. It is a good idea to keep your planes repaired to avoid forced repairs.
Forced repairs happen from time to time to your planes as well. These are basically mechanical breakdowns that randomly happen and your planes are stuck grounded until they are repaired. The repairs can take up to 10 hours to complete. The cost of your planes is based on the distance of your last flight.
Itzamna 07:34, 17 April 2008 (UTC)