Air Tractor AT-401
Air Tractor Inc. is a United States aircraft manufacturer based in Olney, Texas. Founded in 1978 the company began manufacturing a new agricultural aircraft derived from the S-2B aircraft (designed by founder Leland Snow’s previous company, Snow Aeronautical). Designated Model AT-300 Air Tractor, the new aircraft first flew in 1973. In 2004 the 2000th Air Tractor aircraft was delivered.
Amazing set of photos here are from Mark Nankivil.