No. An airplane is a machine, not a gadget.
According to the official definition of 'gadget', the iPod Touch is a gadget.
an electronic gadget is a gadget that has an input transducer a processor and an out put transducer
That depends on the specific gadget.
there isn't one
Inspector Gadget - 1983 Magic Gadget - 2.1 was released on: USA: 14 October 1985
When golfing, a tee is a vital gadget. I find an apple corer to be a vital gadget in the kitchen.
Inspector Gadget - 1983 Gadget's Replacement 1-23 is rated/received certificates of: Australia:G
Inspector Gadget - 1983 Focus on Gadget 2-13 is rated/received certificates of: Australia:G
Inspector Gadget - 1983 Tyrannosaurus Gadget 2-16 is rated/received certificates of: Australia:G
Inspector Gadget - 1983 Magic Gadget 2-1 is rated/received certificates of: Australia:G
Inspector Gadget - 1983 Gadget at the Circus 1-4 is rated/received certificates of: Australia:G
Inspector Gadget - 1983 Gadget in Minimadness 2-7 is rated/received certificates of: Australia:G