Chicago’s Midway Airport is trying to shorten wait times ahead of what’s expected to be the busiest Thanksgiving weekend for travel since 2005. Two new automated checkpoint lanes at the southwest side airport have conveyor belts that draw bags into the x-ray machine and return bins to the front of the line. There’s also more space for travelers to load their belongings into bins, and bags that need to be double-checked are automatically redirected to a separate area. The American Automobile Association says it expects nearly 51 million people to travel 50 miles or more starting next week. It expects 4 million of them two fly.