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by sokoloff 2123 days ago
If that airplane isn't in clouds and is at/above FL180, pilots are still required to maintain vigilance to see-and-avoid other traffic. It's true that positive separation is also provided by IFR rules in class A airspace, but any time you're in visual conditions, you're expected to see-and-avoid.

FAR 91.113.b: https://www.law.cornell.edu/cfr/text/14/91.113