Swingtail

During the flight to California to deliver the first swingtail to Flying Tiger Lines, Coe cruised at 12,000 to 16,000 feet, indicating 278 knots for a true airspeed of 398 mph.

As Wheatcroft has pointed out the development of new all-cargo freighters is essential for economic progress, so with the introduction of the swingtail Canadair CL 44 D4 freighter and another all-cargo service by Pan American Airways shipments by air should improve.

Their first flight took the company's CL‐44 swingtail freighter to Hong Kong in September 1970.

Two other interesting configurations also considered were a removable tail and a vertical swingtail.

It then made a study which eventually convinced the Board that a temporary solution was to lease Canadair CL—44s, a swingtail version of the Britannia freighter which Sir Miles Thomas had tried to order in 1952.