The costs involved in air travel, hotels and car rentals rose continually throughout 2006, according to American Express Business Travel. This followed several years of flat or declining prices. The two main reasons for this, according to Mike Streit of American Express, were strong demand and increased operating costs. He confirmed that "In line with our predictions, capacity constraints, strong demand and high fuel costs prompted transient travel prices to climb in 2006" Read more at:http://www.tourism-review.com/top_weekly_full.php?id=276.