Millions of Americans are on their way home from their Memorial Day travels. AAA estimated 46 million ventured out, mostly on the road. But TSA is also expected to screen around 18 million passengers.

TSA data says four of TSA's top 10 busiest days of travel have been recorded during May.

"AAA booking data (based on what travelers paid when booking Memorial Day weekend flights) shows domestic flights are 2% more expensive compared to last year, with the average roundtrip ticket costing $850. Most of those flights are to popular destinations like Chicago, New York, Orlando, Denver, and Seattle."