A "stellar" market for passenger to freighter aircraft conversions saw Aeronautical Engineers Inc. (AEI) deliver 27 converted aircraft in 2017 to leasing and operator customers world-wide.

Robert Convey, AEI senior vice president of sales & marketing, said: “2017 turned out to be another stellar year for AEI freighter conversion deliveries.

“We expect 2018 deliveries to be comparable to 2017 with 12 aircraft currently undergoing conversion and an existing total backlog of 23 aircraft scheduled for delivery in 2018."

US-headquartered AEI delivered 21 B737-400SF freighters, four MD-83SF freighters, one MD-82SF freighter and one CRJ200 SF freighter.

AEI also announced that the company delivered its hundredth B737-400SF freighter.

Added Convey: “Over the next several weeks we will be announcing additional firm orders for conversions scheduled to begin modification in 2018.”

The B737-400SF will again represent the majority of freighter conversions scheduled for 2018, said AEI, although more deliveries for the CRJ200 SF will be represented as the company currently has seven aircraft scheduled for completion this year.

Additionally, AEI will certify the new B737-800SF freighter conversion in 2018, of which the company already has over 100 firm orders and commitments for the freighter.

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