Checked in and out

What's the meaning of check in and out?
Can I say the following.

1. As we leave the airport, we checked out.
2. We have to check in when we get to the hotel.

1. Before we left the airport ....
2. That's fine.

I didn't know there was any checking out at airports.

sdgsdg said:

What's the meaning of "check in" and check out"?
Can I say the following?

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Before asking here, make sure you do your own research. There are multiple resources available to you so you can find out the meaning of various phrasal verbs. This forum has its own phrasal verb list - see HERE.
Make sure you tell us where you found definitions and, if appropriate, tell us what it is you don't understand about the usage.