Another reason is that many people simply don't feel safe flying at this time.
Reportedly, losses already have cost hotels $1 million to $5 million in expected revenues.
The next big convention in Denver is the National Recreation and Park Association's meeting on Oct. 3 to 6. The event will bring 10,000 visitors to Denver, and has not yet been cancelled, says Eugene Dilbeck, president of the Denver Metro Convention & Visitors Bureau.
"So far, no one has canceled any citywide conventions," Dilbeck tells GlobeSt.com. "They have cancelled a number of meetings at hotels, though."
Retailers and restaurants also suffer when conventions are cancelled.
The 50 conventions booked by the bureau last year brought $192 million to the city. Denver is not alone.
PriceWaterhouseCoopers issued a report that projects the national hotel industry will post its worse performance in 33 years because of fear of terrorism.
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