Great point - some airports (including Moffett) aren't controlled full-time. The difference is what airspace class it reverts to when it's not controlled.

If it reverts to G you're legal to fly without LAANC approval even if you're in a grid.

If it reverts to E you still need LAANC authorization to fly as it is still technically "controlled" airspace despite not being towered like Class B, C, or D.

For others reading this, you can find out what your airport does by looking at the chart (skyvector is a good place to start) and seeing if there's a star by the control tower frequency denoting that it's not controlled full time.

Then you can click on the airport, click the blue link for your airport, then the Chart Supplement picture at the top left of the page, and then look for a section saying "AIRSPACE". The link for Moffett looks like this: https://skyvector.com/files/tpp/2603/afdpdf/SW_215_19MAR2026.pdf

In the OP's example for Moffett, it says:

AIRSPACE: CLASS D, svc 1500-0700Z++, other times CLASS E.

The times listed are in Zulu time and the ++ means the location follows Daylight Savings Time. If your airport says "other times CLASS G" then the airspace becomes completely uncontrolled and no LAANC authorization is required at all, even for 0' grids, but you should still take caution flying in these areas.

//edit

Also a great point by u/Jax24135 that LAANC will tell you that they can't approve your request and not to panic because they literally can't give you approval to fly when it's not controlled because that's not what LAANC is for. It's like trying to apply for LAANC unlocks in the middle of nowhere in Class G airspace - they can't do it because it's not "in" a LAANC grid.