The Grumman S-2 Tracker (previously S2F) was the first purpose-built, single airframe anti-submarine warfare (ASW) aircraft to enter service with the US Navy.
Its predecessor, Grumman's AF-2 Guardian was the first purpose-built aircraft system for ASW, using two airframes, one with the detection gear, and the other with the weapons.
Airplanes - Boneyard and Parts
Links: en.wikipedia.org
By: skyeye