The remaining two Registered Traveler providers, FLO and Vigilant Solutions, have halted operations according to company and Transportation Security Administration officials.

Clear, the main Registered Traveler operator, shut down operations at its 18 airport locations late last month. It operated expedited lines meant to move passengers more quickly through security chokepoints.

The other two providers, FLO and Vigilant Solutions, were hoping to pick up some of those Clear customers, but they, too, have closed their airport operations.

FLO has closed its operations at Reno-Tahoe Airport in Nevada while the future of the Registered Traveler program is debated, said Fred Fischer, company senior vice president and managing partner.

FLO is now negotiating with several airports and hopes to have a deal by the week's end, Fischer said.

Vigilant’s status in Jacksonville, Fla., and Louisville, Ky., is less certain. Company officials could not be reached for comment.

But the TSA released a statement saying, "We have been informed that Vigilant has ceased operations."