I think I have most of the concepts behind Russian choice of imperative down, but I'm having trouble finding information about the difference between perfectives and determinate imperfectives. E.g., what is the difference between:
Иди в аэропорт! / Пойди в аэропорт!
Не иди в аэропорт! / Не пойди в аэропорт!
And would it even be possible to ever say: Не ходи в аэропорт!
Thanks!