Aeronautical Engineers (AEI) has signed a contract with Vallair to provide the company with four 11 pallet position Boeing 737-400SF freighter conversions.

All of the conversions will be modified by Commercial Jet’s Dothan, Alabama facility with the first one commencing in May 2016, followed by the remaining three modifications in June, July and September of this year.

AEI says the B737-400SF is the only passenger to freighter conversion product that offers operators 10 full height container positions, and explains this is unique capability is achievable due to AEI’s main deck cargo door location, which is approximately 40 inches further back than the competition.

The additional container position increases AEI’s volumetric carrying capability by 10% which places the freighter in a class by itself.