Air travelers, beware! Some fares probably will be rising after a 10 percent ticket tax is revived in the next week or so -- even though base ticket prices reflect the tax already.

President Clinton is expected to sign legislation quickly to reinstate a package of aviation taxes that are used to pump $2.7 billion into airport safety projects. The taxes take effect seven days after the president's signature.

"It would be surprising if they did not pass it along," said Chris Privett, spokesman for the American Society of Travel Agents. Others said at least some fares are likely to rise, though one airline industry executive suggested competition among airlines would hold down any increases.