Pittsburgh International Airport recently announced that travelers booked on early morning flights should be in the airport terminal at least two to three hours before their flight because the Transportation Security Administration (TSA) checkpoint lanes are the most crowded between 4 and 7 a.m.

Starting Monday, July 8, between 4 and 7 a.m. on Monday through Friday, the alternate security checkpoint will be open only to travelers enrolled in TSA PreCheck. PreCheck lanes at the main checkpoint will not be open during this time.

After 7 a.m., a TSA PreCheck lane will be available at the main checkpoint through 8 p.m. The alternate checkpoint may reopen during the day on an as-needed basis.