The Halton Mayfly was a British two-seat biplane designed by C.H.

Latimer-Needham and built by the Halton Aero Club between 1926 and 1927.

[1] Registered G-EBOO and named the HAC.1 Mayfly it first flew on 31 January 1927.

[1] It was entered in the 1926 Lympne light aircraft trials as No.

[2] By 1928 the aircraft had been converted from a biplane to a parasol monoplane and was renamed the Halton HAC.2 Minus.