NEW YORK — An expedited screening program called PreCheck was supposed to be the answer to maddeningly long security lines at the airport. But four years after its launch, the Transportation Security Administration is far short of enrolling enough travelers to make a difference, spelling trouble for summer travel season.

Fliers can expect massive security lines across the country, with airlines already warning passengers to arrive at least two hours early or risk missing their flight.

Travelers wait in line to enter the security area at the Portland International Jetport in this November 2014 photo. Paul Bradbury, the jetport's director, says he's already seeing lines start to grow. Gregory Rec/Staff Photographer

The TSA cut its airport screener staff by 10 percent in the past three years, anticipating PreCheck would speed up the process. When not enough fliers enrolled, the agency tried to make up for that shortfall by randomly placing passengers into the express lanes. But it recently scaled back that effort for fear dangerous passengers were being let through. That’s when the lines started growing, up to 90 minutes in some cases.

The TSA is shifting some resources to tackle lines at the nation’s biggest airports, but says there is no easy solution to the problem with a record number of fliers expected this summer.

“We had unacceptable line waits at the majority of our hubs,” says Robert Isom, chief operating officer of American Airlines. “Based on what the TSA is telling us, there is no relief in sight.”

That’s unwelcome news for Paul Bradbury, the director of the Portland International Jetport. The jetport broke records for summer and fall passenger travel last year, and expects another busy year, especially during the summer when tourists flock to Maine.

Bradbury said the TSA used to have two advanced body-scanning machines in Portland, but removed one to another airport, thinking that more people would go through the PreCheck program. But now, with only one machine at the jetport and TSA staff cuts, Bradbury said he’s seen lines start to grow.

“Between the staffing and equipment issues, we’ve noticed some (longer waits),” he said. Roughly a third of passengers going through screening in Portland are selected for PreCheck, according to a four-week AP data analysis.

In fact, Bradbury said he had hoped that reduced security congestion would allow the jetport to advise travelers to arrive an hour before a flight to make sure they get to their gates on time. But persistent longer lines have caused him to leave that advisory at 90 minutes.

TSA data from Jan. 31 to Feb. 27, 2016 indicates that the Portland International Jetport had a higher proportion of PreCheck passengers than other airports with similar passenger volumes:

A SECURITY SQUEEZE

Launched nationwide in 2012, PreCheck gives previously vetted passengers special screening. Shoes, belts and light jackets stay on. Laptops and liquids stay in bags. And these fliers go through standard metal detectors rather than the explosive-detecting full-body scanners most pass through.

PreCheck lanes can screen 300 passengers an hour, twice that of standard lanes.

The TSA offered Congress a lofty goal of having 25 million fliers enrolled in the program. Based on that and other increased efficiencies, the TSA’s front-line screeners were cut from 47,147 three years ago to 42,525 currently. At the same time, the number of annual fliers passing through checkpoints has grown from 643 million to more than 700 million.

As of March 1, only 9.3 million people were PreCheck members. Applicants must pay $85 to $100 every five years. They must also trek to the airport for an interview before being accepted. Getting once-a-year fliers to spend the time or the money to join has been a challenge. While 250,000 to 300,000 people are joining every month, it will take more than four years at that pace to reach the target.

“It hasn’t been a failure; it just isn’t moving as quickly as it needs to move,” says Sharon Pinkerton, senior vice president for legislative and regulatory policy at airline trade group Airlines for America.

Without enough members, the TSA faced a problem: PreCheck lanes were nearly deserted while other lines snaked throughout terminals. Keeping empty PreCheck lanes open was a waste of staff. But without them, passengers who paid to join would be annoyed.

So the agency created workarounds to allow passengers who hadn’t been fully vetted to still get expedited screening.

Those who flew 50,000 miles a year or more with an airline sometimes got the PreCheck designation on their boarding pass at check-in. Others would randomly get it based on demographic information.

As a further step, the TSA in 2013 created a program called Managed Inclusion where it randomly pulls people out of the normal line when it grows too long. Fliers’ behavior is monitored, they are screened for explosives and then allowed to use the faster PreCheck lane.

The Associated Press has spent the last year fighting under the Freedom of Information Act for details on how many fliers are allowed into PreCheck through each method, but has been denied the information for unspecified security reasons.

Lines did get shorter. By Thanksgiving 2014 nearly 50 percent of fliers were getting expedited screening.

Then last year, two back-to-back embarrassing inspector general reports came out, highlighting TSA security lapses. One disclosed that the agency let a convicted domestic terrorist use PreCheck. The second revealed that in 67 out of 70 tests across the nation, screeners failed to find mock weapons and explosives.

In response, TSA agents stopped pulling passengers out of line unless there was an explosive-detecting canine team present. That change went into effect in September, right after the Labor Day rush.

The move forced about 10 percent of all passengers — some 70 million fliers a year — to go back to normal screening.

Longer lines soon followed. By February, just 26 percent of passengers were screened through PreCheck, according to Associated Press calculations on TSA data obtained through a public records request.

During the week of spring break in mid-March, 6,800 American Airlines passengers missed their flights because of long checkpoint lines, foreshadowing the headaches airlines fear during the peak summer travel months.

“The TSA is more or less suggesting that we need to live with it,” says Isom, American’s chief operating officer.

At Seattle-Tacoma International Airport waits have topped out at 90 minutes, with the typical morning rush averaging 45 minutes to an hour, says Wendy Reiter, the airport’s director of security and emergency preparedness. In the first week of March, 50 Delta Air Lines passengers missed international flights — the type of flight that only departs once a day.

Last week, officials in Charlotte, North Carolina, were warning passengers of waits exceeding 75 minutes, saying the lines were “extremely heavy.”

At the world’s busiest airport, in Atlanta, General Manager Miguel Southwell told the TSA last month that “things appear to be only getting worse.”

And in Minneapolis, executive director Jeffrey Hamiel told the TSA that “we are experiencing unacceptably long security wait times during peak periods.”

The TSA knows there is no quick fix.

“The real answer to the volume growth is to ideally get a fully vetted, trusted traveler population,” TSA Administrator Peter Neffenger told The Associated Press.

For now though, the agency is relocating 28 of its 142 canine teams to the 20 busiest airports so it can randomly put more fliers into PreCheck. The TSA won’t say which airports are losing the teams and could therefore have longer lines.

An additional 200 screeners are being trained each week, but that is offset by the average 103 screeners the TSA loses weekly through attrition. The agency is asking airlines to enforce carry-on bag restrictions before checkpoints so it has fewer bags to screen. Airport and airline staff will also take over some non-security related tasks, such as returning empty bins to the start of the checkpoint.

There has been one bright side: The TSA says there is a direct correlation between longer lines and a spike in PreCheck enrollments.

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