DALLAS (AP) — The partial government shutdown is starting to affect air travel.

Over the weekend, some airports had long lines at checkpoints, apparently caused by a rising number of security officers calling in sick as they face the prospect of missing their first paycheck this week.

Safety inspectors aren't even on the job. A Federal Aviation Administration spokesman said Monday that inspectors are being called back to work on a case-by-case basis, with a priority put on inspecting airline fleets.

So far, the most visible signs of the shutdown — in its 18th day Tuesday — include the closure...