different between aircraft vs wifferdill

English

From air +? craft.

aircraft (plural aircraft)

A vehicle capable of atmospheric flight due to interaction with the air, such as buoyancy or lift

The nonstandard plural form aircrafts is in use among non-native speakers of English.

wifferdill (plural wifferdills)

(aviation) An aerobatic manoeuvre in which an aircraft makes a series of very tight turns in order to reverse its direction of travel.
- 2003, Dik Alan Daso, Doolittle: Aerospace Visionary, ?ISBN, p. 20.
  Doolittle executed a grand wifferdill—rapidly climbing to exchange airspeed for altitude—after completing the course, then a perfect landing.

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