WASHINGTON – The government is fining Delta Air Lines Inc. $750,000 for bumping some passengers involuntarily, without offering compensation or seeking volunteers first.

Airlines sometimes sell too many tickets for a flight, and have to “bump” some fliers or move them to a later flight. If travelers don’t volunteer, the airline has to compensate them.

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The Transportation Department said Wednesday it reviewed 310 complaints about how Delta handled overbookings between November 2010 and January 2012 and found numerous cases of noncompliance.