He was impressed by the river chariots in Hannibal, and wanted to become a steamboat captain. Mark Twain even got an apprenticeship with a steamboat captain.
In Mark Twain's writings of the Mississippi river that borders Hannibal, he claimed he was extremely impressed and fascinated by the Mississippi river.
For more about Hannibal, Missouri you can visit https://hannibal-mo.gov
If we are talking about the airplane terminology, to to take off means to leave the ground, to start flying. So, the opposite of that verb would be to land.
Answer: Evidence collected in a casual or informal manner and relying heavily or entirely on personal testimony.
The first thing that came to mind for me was "The budget committee estimated the costs of building a new stadium." Hope that helps!