Las Vegas: The travel industry of China, India, Brazil are all set to witness a boom in  international tourism in the coming years, showering money and jobs on countries ready for it, and trouble for those that aren't, industry leaders say international tourism.

With an estimated two billion new middle class consumers expected to come into the markets from those emerging powerhouses over the next two decades, the travelindustry sees a potential gold rush ahead.

David Scowsill, CEO of the World Travel andTourism Council said,"The growth of China outbound travel is moving at a huge pace -- it is about 20 per cent increase every year. And the number of outbound Chinese travelers hit 58 million last year."

"And if you look ahead, (with about) 1.6 billion coming out of China and India, they are a huge amount of people coming in with money to burn," he said.

The impact of that coming wave is a top topic at a three-day global travel and tourism summit that opens on Tuesday, drawing CEOs from many of the world's largest travel companies and top tourism officials.

The US is sending Homeland Security Secretary Janet Napolitano, Transportation Secretary Ray LaHood and Valerie Jarret, a top advisor to President Barack Obama. Mexico'sPresident Fernando Calderon is the guest of honour.

Barriers to travel, technological innovation and change, body blows to tourism in quake-struck Japan and the turbulent Middle East also are on the agenda here.

But organisers say that they want to get government officials and industry leaders thinking about what the arrival of the Chinese, Brazilians, Indians and others from newlyaffluent countries will mean for their national economies and the international travel business.

 Scowsill said,"We'll ask the attendees whether they are ready to absorb that level of growth.Are governments ready with infrastructure build?”

Roger Dow, of the US Travel Association, calls the conflict between the projected surge in demand and lagging infrastructure "a real chicken and egg."

"As we build this travel, which will happen, we'll also have to take a real hard look at our infrastructure, our next generation systems for airports, and adding airport capacity," he said.

Countries that haven't caught up in time are likely to be cursed with fun-killing bottlenecks and overcrowding as millions of new tourists pour through the global travel system.