Important to the Way It Works; Anagram of Triangle
This page is the CodyCross answer for the clue below from Airport, Group 458, Puzzle 1 (Controlled Airspace).
Question is: Important to the Way It Works; Anagram of Triangle
and the answer is: INTEGRAL
Word Meaning:
INTEGRAL — Constituting a whole together with other parts or factors; not omittable or removable.
Definitions from Wiktionary.