As the deadline to approve funding for several government agencies nears, so does the possibility of a partial shutdown.

» RELATED: Here’s what could happen during a partial government shutdown

If Congress doesn’t pass a funding bill, which must be signed by the president, a partial shutdown could occur, which could cause many federal agencies to be disrupted.

Wondering about air travel? Here’s what you should know.

Air travel services should continue to operate without interruptions as well as customs and border agents. Amtrak, a government-owned corporation, would also function as usual.

» RELATED: How metro Atlanta parks could be disrupted by government shutdown

That's because employees under the Federal Aviation Administration and Transportation Service Administration are considered essential. They are necessary to protect life and property, such as processing passengers, USA Today reported.

These employees may not be paid on time though.

More than 50,000 TSA agents and more than 50,000 customs and border protection agents would be working without pay, according to a fact sheet released by the Democratic staff of the Senate Appropriations Committee. These essential employees are typically paid retroactively whenever Congress approves a funding bill.

If you're curious about the federal departments and services that would be impacted, take a look here.

» RELATED: When was the last government shutdown? A timeline of US shutdowns

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