Last week, we reported on a Transportation Security Administration announcement that participating members of United Airlines’ MileagePlus program are now eligible for TSA’s PreCheck expedited security inspection at Chicago O’Hare. But United now says the program for its frequent flyers is even broader than that.

In addition to O’Hare, United said, “MileagePlus members participating in this program may be eligible for expedited security screening in Atlanta, Boston, Reagan Washington National, Minneapolis-St. Paul, Portland (Ore.) and Seattle,” with more airports to be added later this year. On its website, United indicated that three of those additional airports – described as “coming soon” – are Houston Bush Intercontinental, Los Angeles International and Newark Liberty International.

United noted that eligible MileagePlus members “are being invited to participate in the initial phase.” The process involves pre-screening of passenger information before acceptance into PreCheck; participants are identified by a special indicator in the bar code of their boarding pass. That makes them eligible for the TSA to direct them to the expedited screening lane, where they may be able to go through security without removing shoes, belts and jackets and without removing laptops and liquids form their carry-ons, speeding up the process. The program is also open to individuals who participate in one of the U.S. Customs and Border Protection trusted traveler programs, like Global Entry. United MileagePlus members who want to participate can apply by signing into their MileagePlus account. For details, go to www.united.com/tsaprescreening.

The PreCheck program is also open to participating frequent flyers at American, Delta, Alaska Airlines, and most recently, US Airways at Washington Reagan National. More than 1.5 million travelers have gone through the expedited screening since PreCheck testing started up last fall.

In other security news, the Clear biometric screening plan has expanded its members-only fast security access to Terminal E of Dallas/Ft. Worth Airport. The Clear program, which costs $179 a year, lets members bypass the long security lines and access TSA security inspections through a special lane, which they can enter after verifying their identity with a Clear card. Clear is already offered at the Orlando, Denver and San Francisco airports.