At what altitude do jet routes start?

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Multiple Choice

At what altitude do jet routes start?

Explanation:
Jet routes are high‑altitude enroute airways designed for faster aircraft and are located in the upper airspace. In the United States, the lower boundary of this airspace is where Class A begins, which is at 18,000 feet MSL. Because pilots use flight levels above the transition altitude (standard pressure setting), the starting point for jet routes is FL180 (18,000 ft). Below that, the airways are the lower-level Victor routes that span up to 17,999 ft MSL. So jet routes start at FL180, not at 10,000 ft, FL200, or 35,000 ft.

Jet routes are high‑altitude enroute airways designed for faster aircraft and are located in the upper airspace. In the United States, the lower boundary of this airspace is where Class A begins, which is at 18,000 feet MSL. Because pilots use flight levels above the transition altitude (standard pressure setting), the starting point for jet routes is FL180 (18,000 ft). Below that, the airways are the lower-level Victor routes that span up to 17,999 ft MSL. So jet routes start at FL180, not at 10,000 ft, FL200, or 35,000 ft.

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