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For Class B airports, I think the answer is realistically yes, due to traffic flows. How about Class C airports? Are there any legal requirements that it has to operate in 24/7, or is a convention?

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  • $\begingroup$ I believe KXNA is an example. $\endgroup$ – BowlOfRed May 26 '16 at 6:54
  • $\begingroup$ No, many class C airports close, for example KGRB is attended 0500-2200 and closed at other times, during which the airspace turns into class E or G (can't remember). $\endgroup$ – Ron Beyer May 26 '16 at 13:18
  • $\begingroup$ Here is another example - KMRY. $\endgroup$ – skyoasis May 28 '16 at 6:51
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The short answer is no. It's easy to find examples of class C towers that aren't 24/7, by checking in the Chart Supplement. Two examples are KXNA (as mentioned in the comments) which operates 1130-0500Z and KHSV, which operates 1200-0600Z. Note that the airspace changes when the tower is closed: KXNA becomes class G, and KHSV becomes class E.

As for class B, I would also assume that they're 24/7. I checked a few (KATL, KBOS, KSEA) in the Chart Supplement and they are indeed 24/7 but I don't feel like checking them all :-)

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    $\begingroup$ KNKX although not public use is class B and is not continuously manned. $\endgroup$ – Ron Beyer May 26 '16 at 13:23
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    $\begingroup$ @RonBeyer That's an interesting example. The Chart Supplement says it's E, not B, but the TAC certainly makes it look like B. $\endgroup$ – Pondlife May 26 '16 at 13:35
  • $\begingroup$ Wikipedia lists it under class B, that's where I got it from. $\endgroup$ – Ron Beyer May 26 '16 at 13:45

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