WICHITA, Kan. (AP) — Preparations for a new line of KC-46A tankers are keeping construction workers busy at McConnell Air Force Base in Wichita.

Sixteen military construction projects are underway at the base, with a total estimated cost of $267 million. Ben Davis, project manager with the Kansas City district of the Army Corps of Engineers, says the projects are on schedule.

McConnell was selected in 2013 to be the first active-duty base in the country to receive new KC-46A tankers, which will replace its aging fleet of 1950s-era KC-135 refueling tankers. The base will eventually receive 36 of the new tankers.

The Wichita Eagle reports the first three hangars for the tankers are scheduled to be completed by March 2016 at the latest, with the following three completed about a year later.