In 1970 the Emair division of Emroth Company began production at Harlingen, Texas, of Emair MA-1 agricultural biplane (Boeing-Stearman Model 75 derivative). The type had received FAA certification in Hawaii, though built by Air New Zealand and first flown in that country July 1969. Emair's production of 25 ended January 1976. More powerful MA- 1B Diablo 1200 flew 1975 and deliveries followed. Special features included new wings and hopper forming integral part of fuselage.