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Aug 7 at 0:39 comment added user71659 5 is the opposite on a jet. With autopilot being basically mandatory in cruise, you need a means to conveniently activate the PTT that keeps the pilots hands away from flight controls and ideally other controls. So you end up with a handheld PTT switch, and there's little difference to go from that to a hand mic.
Aug 6 at 13:36 history edited Halzephron CC BY-SA 4.0
Edit to make it more like a proper answer to the OP's question and explain why it is rare though.
Aug 6 at 9:22 comment added Halzephron @gabe as mentioned in my answer there where production aeroplanes that didn't use headsets. Older biplanes didn't have them at all. In the early days of flying in England, they used a speaking tube called a "Gosport Tube" to communicate between student and instructor. These days, however, headsets can be retrofitted in almost any aeroplane so the choice ultimately down to the pilot (crew) and whether or not radio is being used. There isn't a specific type of aircraft in which there is no option to upgrade to a headset, so pilots will generally choose to do so, or just go non-radio.
Aug 5 at 20:14 comment added Gabe Is there an airplane that doesn't use hand/head mic?
Aug 4 at 22:53 comment added Solomon Slow @AeroAndy, I remember those! aircraftpartsandsalvage.com/wp-content/uploads/2018/04/…
Aug 2 at 17:04 comment added John K @AeroAndy I wore foam earplugs for years but they are fairly useless in airplanes protection wise because the bulk of the noise is in the 70-120Hz range, where there is very little attenuation. However foam earplugs are a good supplement to ANR headsets that don't attenuate higher frequencies very well, if you really want to protect your hearing. Absent an ANR headset, I now use 3M plug-ins with several grams of lead tape wrapped around the shaft and covered with heat shrink. The low freq attenuation is nearly identical to my Zulu 3.Turn the ANR off while wearing them, I can't tell the diff.
Aug 2 at 14:16 comment added AeroAndy I learned to fly in C150 many years ago and the instructor clued me in to crank up the speaker volume and use foam ear plugs. So nice now to have sound cancelling or just sound deadening headphones and not have to fumble around reaching for the mike.
Aug 2 at 13:05 history answered Halzephron CC BY-SA 4.0