On Monday, the US Transportation Department implemented regulations requiring airlines to allow passengers on board delayed flights to deplane after three hours.
Starting in April 2010, no aircraft on US domestic flights can remain on an airport tarmac for more than three hours without deplaning passengers. Exceptions are allowed for safety or security, or when air-traffic controllers notify a pilot in command that returning to a passenger terminal would disrupt airport operations. Non-US airlines and international flights are excluded from this rule.
Visit this link to read more: http://www.usatoday.com/travel/flights/2009-12-21-tarmac-strandings-limi...


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According to the new rules, the United States-based carriers operating domestic flights will be allowed to keep passengers inside a plane only for a maximum of 3 hours in case of a delayed flight. After this period, the passengers should be allowed to disembark.Exceptions to this rule are allowed only in cases involving safety or security, or if air-traffic control tells the pilot in command that returning to the terminal will disrupt operations of the airport.
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Some aviation experts have predicted that, faced with the possibility of multimillion-dollar fines for every seriously delayed plane, airlines would implement wholesale cancellations in poor weather well before the three-hour tarmac limit, inconveniencing the flying public more deeply than by waiting out long flight delays and eventually taking off. dtw parking