In the non-DRVSM discussion, eastbound and westbound flight levels are:

• A. Eastbound 290, Westbound 310
• B. Eastbound 310, Westbound 290
• C. Eastbound 300, Westbound 320
• D. Eastbound 320, Westbound 300

Answer: (A)

In non-DRVSM airspace, opposite-direction flights on the same routes are kept 2,000 feet apart, with the eastbound flight at the lower level and the westbound flight at the higher level. That means the correct pairing places the eastbound at the lower flight level and the westbound at the higher one, giving the required 2,000-foot separation. The example that follows this rule fits best because it uses the lower level for eastbound and the higher level for westbound, satisfying both the direction convention and the spacing. Other pairings would place the eastbound on the higher level or fail to provide the 2,000-foot separation, so they don’t align with the established standard.