You can get on a flight with no id.. You just have to go through extra security and wait time.. Bit of a hassle but possible.. Have done it a few times myself..
Wow, I am scared that these might be real people asking real questions... have you been on a plane since 1983?
Not that I've ever heard of.
The previous answer is correct and that can also be a passport.
Nope you must have one form of valid picture ID
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