Airports in South Florida say they have plans in place to help airlines stick to the FAA's new three-hour limit on tarmac delays. But they warn that weather situations -- such as a violent thunderstorm on Monday that held a Frontier Airlines flight on the ground in Fort Lauderdale for 2 hours and 45 minutes -- can develop very quickly. Severe weather can put ramp workers off duty, delaying the offloading of passengers and risking millions of dollars in fines for the airline. Security could be a problem, too, especially when international flights are diverted to smaller airports with limited Customs and Border Protection facilities.

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