Massive girders and freshly poured concrete form a bump in the middle of the low-slung terminal, almost as if BWI Marshall Airport is expecting.
In a way, it is.
Before next summer, a glassed-in walkway, new shops and a modern security checkpoint will spring from the framework. Passengers will be able to get from the concourses used by Southwest and AirTran to the one used by American and Spirit without leaving security. By the time summer is out, the oldest part of BWI will be modernized and directly connected to the busiest part.
Between the terminal expansion and a four-year runway rehabilitation program, BWI is spending $456 million to hold off the competition.
"People of this region don't know how good they have it," said Greg Principato, president of Airports Council International-North America, a major trade group. "I hope they don't take BWI for granted."
It is a warning the Greater Baltimore Committee, a group of civic and business leaders, takes seriously.
"Transportation often doesn't become a priority until it becomes a crisis, and once it becomes a crisis, it's difficult to dig your way out," said Donald C. Fry, the committee's president and CEO.
Last Friday, the airport opened the newly repaved and extended runway, just in time for holiday travel. The $40 million project is part of a larger $356 million blueprint to bring all of BWI's runways up to Federal Aviation Administration standards by 2015.
Also last week, the state Board of Public Works approved a $29 million contract to expand and refurbish Concourse C, "the oldest and dankest part of the terminal," said Paul Wiedefeld, BWI's executive director. The work is the final phase of a $100 million renovation that will expand the security sceeening stations to nine from six, hopefully speeding travelers through the time-consuming lines.
"We need to keep up, to show customers — business and passengers — that they're getting a good bang for the buck," Fry said.
So far, so good. BWI's traffic continues to grow.
Last year's commercial passenger count of 22.4 million topped the 2010 level, itself a record. This year most likely will eclipse last year. International passenger traffic increased 11 percent last year and cargo shipments reached 118,500 tons, an increase of 5.3 percent over 2010.
In the last two fiscal years, the Maryland Aviation Administration, the state agency that has owned and operated BWI since 1973, has generated enough revenue to cover both its operating and capital expenses.
Contrast that with airports in Pittsburgh and Cincinnati, Principato said.
The home of the Steelers saw its air traffic plummet after US Airways decided in 2003 that it didn't make sense to use Pittsburgh as a hub when Philadelphia was just an hour's flight away.
So, despite having a $1 billion terminal and state-of-the-art runways, Pittsburgh International Airport expects to serve just 8.3 million passengers this year, not the nearly 41 million projected by the 1991 master plan for the facility. Instead of having 633 nonstop flights a day to 114 destinations, the airport has 155 daily flights to 36 airports.
Cincinnati also is a shadow of its former self, placed on a starvation diet when Delta Air Lines downsized its hub. Total daily flights plunged to 170 departures last year from 650 in 2005. Two of three terminals sit empty.
"BWI has control of its aviation future," Principato said. "In the 1980s, there were concerns about its ability to survive. No one says that now."
That future includes new airlines and increased international traffic.
Condor Airlines, which began twice weekly seasonal service to Frankfurt, Germany, from BWI Marshall last summer, has agreed to resume its service next year. That addition helped increase international passenger traffic 40 percent in September over a year ago.