G.D.G. Aviation Inc. is a Quebec firm specializing in the control of biting insects using Bacillus thuringiensis serotype israelensis (BTI) which is a naturally occurring larvicide which is toxic to mosquitos and black fly larvae. G.D.G. uses ground crews, fixed-wing aircraft and helicopters to drop BTI in wetlands. In April 2016, GDG had two Bells and two Cessna 188s based at Mascouche Airport (CSK3) working north of Montreal. B206L-3 C-FIEE is ex-N426JF, D-HAFW, N29GH, RP-C820, N67EA & lastly N19TD. More than 100 aircraft were evicted when CSK3 airport permanently closed on Nov. 15, 2016.