sentences:  It first flew on 10 April 1933 and was the first British type with a retractable undercarriage to go into production, with a total of 16 built.The prototype Courier was designed by Hessell Tiltman (co-founder of Airspeed Limited) and was built in 1932 by Airspeed at York for an attempt by Sir Alan Cobham to carry out a non-stop flight to India, using airborne refuelling.Airspeed moved from York to Portsmouth before the Courier "G-ABXN" first flew on 10 April 1933.