The head of the TSA comes to Chicago Friday to find out why there were unusually long lines and waits this week at O'Hare and Midway Airport security gates.
Travelers stood in lines for as long as three hours at security Wednesday.
Thursday, they were told to arrive at least two hours before departure.
The TSA has responded by sending 58 agents to Chicago to help.
They're also upgrading 100 part-time TSA workers to full time.
U.S. Sen. Dick Durbin (D-IL) says airlines could increase efficiency by eliminating fees for checked baggage. He says more people are taking larger bags on board to cut costs, increasing the time it takes to screen those bags at security.
Mayor Emanuel and other city leaders have suggested that security screenings be done by private contractors if government workers can't pick up the pace.
Thursday, the TSA showed the public what kinds of issues agents face that slow down the process during screening.
Officials blame the bulk of the problem on staffing shortages and the high volume of passengers.