trafficThose waiting for a Dollar Thrifty deal to be consummated might be advised to remain patient — Washington has another idea for those hoping for speed.

Hertz Global — which has signed a deal to buy Dollar Thrifty — said on Tuesday it received a request for more information from the U.S. Federal Trade Commission. That comes a day after Avis — which has yet to bid, but has suggested that it would like to trump Hertz — said it received its own notice from the FTC.

Either bidder could face close antitrust scrutiny, experts told Reuters in May.

“This will be a long process (for either bidder) because the regulatory process would take nine to 12 months,” MKM Partners analyst Christopher Agnew said then.

Avis, Hertz and Dollar Thrifty, along with market leader Enterprise, control about 96 percent of the U.S. car rental market and operate eight brands among them.