Construction consultant Hill International Inc., of Marlton, said it won a four-year, $7.2 million extension to its contract as program manager for ongoing projects at Philadelphia International Airport and Northeast Philadelphia Airport.

The airports have a $3.6 billion capital improvement program planned through 2013, that includes terminal expansions and runway extensions and additions. Hill has been program manager for the Philadelphia Airport System since 1989.

Hill International, has 1,500 employees in 70 offices around the world. Shares were up 5.2 percent, or 63 cents, to $12.73 in morning Nasdaq trading.