[BatGuano]

Hmmmm, 18,000 feet?
Don’t go throwing numbers around like that. There are many factors that require a flight plan to be filed.

[ought-six]

“Hmmmm, 18,000 feet? ‘

Yes.

“Don’t go throwing numbers around like that. There are many factors that require a flight plan to be filed.”

IFR and flying over DC or ADIZ. Much other than that, no flight plan is required to be filed.