A complex annexation plan that could bring 1,300 acres, 116 households and the Manassas municipal airport inside the Manassas City limits has been approved by both the Manassas City Council and the Prince William County Board of Supervisors.

But despite unanimous support for a plan that has taken months to negotiate, it still may be a long time before it comes to pass.

As it was negotiated, the plan will not become binding unless the Virginia General Assembly passes legislation giving towns and counties the power to negotiate annexation contracts out of court, the route taken by Manassas and Prince William County. The city council has requested Northern Virginia's General Assembly delegation to seek passage of the necessary legislation. Leesburg, which is trying to annex seven square miles of Loudoun County land, is seeking the same authority.

As part of the agreement, the county will pay Manassas $2.5 million for a 20 percent interest in the airport plus a guaranteed amount of water from the city impoundment of Lake Manassas.

Manassas Vice Mayor Stewart Vetter said the resolution to adopt the plan included a provision that $1 million of the $2.5 million be put in a fund to be used for school construction. The Manassas school board has requested $11.5 million from the city to build a new high school in order to ease crowding at the 29-year-old Osbourn Senior High School.