Fort Lauderdale-Hollywood International Airport operations director Mike Nonnemacher said he learned Tuesday from the TSA that the airport would be getting an unspecified number of the scanners. "We'll do what we have to to make the space available for these machines," Nonnemacher said.

About half of nearly 40 airports that answered a survey last month by the Airports Council International said their security checkpoints are too small to handle the machines, according to Christopher Bidwell, the council's security chief.

The new scanners will bring the total number of airports with the machines to 29. That includes 17 of the nation's 30 largest airports.

Airports with scanners will continue to use metal detectors, both as an alternative for passengers who want to avoid the machines and in checkpoints without the scanners. Passengers who opt to skip a scanner will go through a metal detector and be hand-searched by a screener.

Officials at Cincinnati/Northern Kentucky International Airport are not worried about the TSA plan, airport spokeswoman Barb Schempf said. The airport recently finished a new checkpoint. "It was constructed in anticipation of this type of equipment being installed," Schempf said. "We're probably in a better position than most."