There were five flights stuck on the tarmac for three hours or more in May, the first month under a new rule banning lengthy tarmac delays, the government said Thursday.

It will be several weeks to a month before any fines may be levied against the airlines for violations, as the Department of Transportation investigates. The maximum fine is $27,500 per passenger for airlines that do not return their planes to the terminal when they are delayed on the tarmac for three hours or more. There are exceptions for safety and security reasons.

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