By Jim Donovan:   Megabus kicked off a summer seat sale today.   Almost 90,000 $5 and $9 seats are being added in 28 cities on select days for the month of June.

The additional $5 and $9 seats are available for travel on Tuesdays, Wednesdays and Saturdays on select routes.   Out of Philly the sale seats are available on Harrisburg, Pittsburgh and Wash. D.C. routes.

Tickets must be booked online at at least seven days prior to departure, are available for travel from June 1-30, 2013 and are subject to availability.

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