What is the upper limit of the jet route altitude stratum?

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Multiple Choice

What is the upper limit of the jet route altitude stratum?

Explanation:
Jet routes are the high‑altitude en route airways used by fast, jet-powered aircraft. They have a defined altitude band, spanning from Flight Level 180 up to Flight Level 450. The upper limit at Flight Level 450 marks the maximum altitude for this jet route stratum. Above that level, aircraft primarily use different upper air routes or RNAV-based routing, rather than the standard jet routes. So the best choice is Flight Level 450 because that is the highest altitude included in the jet route system.

Jet routes are the high‑altitude en route airways used by fast, jet-powered aircraft. They have a defined altitude band, spanning from Flight Level 180 up to Flight Level 450. The upper limit at Flight Level 450 marks the maximum altitude for this jet route stratum. Above that level, aircraft primarily use different upper air routes or RNAV-based routing, rather than the standard jet routes. So the best choice is Flight Level 450 because that is the highest altitude included in the jet route system.

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