Originally Posted by House
No. There are plans to start scanning on exit, but even then it is merely to take a record, not to do a direct comparison. I really don't think this will be a problem for you.
There are self-service exit scans at PHL, at least if you have a visa.
Other airports:
Originally Posted by dhs website
US VISIT Exit procedures are being tested at the following airports:
Baltimore/Washington International
Chicago O’Hare International
Dallas/Fort Worth International
Denver International
Detroit Metropolitan Wayne County International
Fort Lauderdale-Hollywood International
Hartsfield-Jackson Atlanta International
Luis Muñoz Marin International in San Juan, Puerto Rico
Newark Liberty International
Philadelphia International
San Francisco International
Seattle-Tacoma International