One of three shelf lives
Answers That Do Not Change
Three properties of the ground. They were true last year, they will be true next year, and establishing them at the start of a trip means never asking again.
Cheap to ask, expensive to discover late
None of these three needs an operator on the telephone. None of them expires while somebody thinks about it. All three can rule a trip out before a single quote is assembled, which is exactly when it is useful to know.
A request that arrives with them settled goes to operators immediately. One that does not may collect quotes for a trip that cannot physically happen.
What is fixed and what is not
The runway length is fixed; what a given aircraft can do with it is not, and moves with temperature, load and elevation. The customs arrangement is fixed; whether it is staffed at a particular hour is not. The published hours are fixed; whether the field will open outside them by arrangement is not.
In each pair, the fixed half belongs on this shelf and the moving half belongs to the operator. This desk does not calculate either.
Where they bite hardest
International trips and small fields. Both are the ordinary reason people charter in the first place, and both are where a fixed property quietly reshapes a plan.
The three
- Answers that do not changeHow long the runway isA property of the ground. It was the same last year, it will be the same next year, and it decides which aircraft can use a field at all.
- Answers that do not changeWhether the field takes customsA field either clears international arrivals or it does not. The answer never changes and it decides whether a trip can end where somebody wants it to end.
- Answers that do not changeWhat the hours of the field areNot every airport is open all night. A field that closes at ten decides the last possible departure, and no operator can reopen it.