What are the red circles?

I’ve noticed two red circles over some of the USA, what are those? I think they might be no-fly zones but I’m unsure. (If they are, does that have any significance in IF?)

Those would be Restricted Airspace in Colorado.

See below, thanks Laura. Couldn’t find the link.

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This will help. (-:

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Ah, okay. Are there specific aircraft (e.g. fighters) which can fly in them?

As Chris said, the airspace is closed up to a ceiling of FL120 to planes bigger than a A321 and a 757 as people were flying into KASE with 748s.

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FL starts at 18,000 feet ;)

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