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At London's busy Heathrow Airport, management consultant James MacDonald said before he boarded a flight to Denver that he would not mind an extra wait if it enhanced flight security.

"I can understand why if you're from Pakistan or whatever it would make it even worse," said MacDonald, a 52-year-old American. "On the other hand, if it's a question of safety, I really don't see any argument there."

Germany increased security at all airports following the failed Christmas Day attack, but authorities said Monday no further measures have been taken since. In Switzerland, authorities were studying the new U.S. security measures, but so far the old controls were still in place.

And in Spain, U.S.-bound passengers from countries on the new watch list were not being singled out for body frisks, according to a security official who spoke on condition of anonymity in line with agency rules.

There is no European-wide consensus yet on the need for full body scanners - which are being sought in Britain by Prime Minister Gordon Brown - but European Union officials said the issue will be raised at a special security meeting soon.

Amsterdam's Schiphol Airport begin using two full-body scanners on flights to the U.S. last week and was pressing to retrofit 13 others with special, less invasive software to put them into use in the next three weeks.

Some travelers thought concerns about privacy were overrated.

"I think privacy can be easily sacrificed in the name of security," said Mauro Forno, a 46-year-old tourist who flew into Rome from Genoa with his family. "Nudity is not a problem for anybody at the beach in the summer."