Add to this the hassle of tightened airport security, threats of disease outbreaks such as SARS, and increased risk of terrorism, and conferencing has become a booming market. The price of compliments such as lodging and car rentals is increasing. The overall lodging industry earned an estimated $20.8 Billion in profit before taxes in 2005, and those earnings are expected to increase by 21% in 2006 thanks to an increase in revenue per available room defined as the occupancy rate times average daily room rate. In the second quarter of 2006, one of the world's largest hotel chains, the Marriott, has an increase in net income of 100% over the 2005 quarter. Revenue per available room was up 8.4% over 2005, the most in more than 20 years. Improved demand combined with higher supplier costs is placing upward pressure on car rental rates and surcharges. Average daily car rental costs are expected to be 2% higher in 2006 than they were in 2005.

U.S. airlines carried 4.6% more passengers and flew more flights during 2005 than they did during 2004 on both domestic and international flights from the United States. Even though demand is increasing moderately, the industry...

The competition appears to be having more of an impact on prices than substitutes or compliments at this point in time.
Works Cited

2005 total airline system passenger traffic up 4.5% from 2004. (2006, April 27). http://www.bts.gov/press_releases/2006/bts020_06/html/bts020_06.html

Air travel demand elasticities: Concepts, issues and measurement. http://www.fin.gc.ca/consultresp/Airtravel/airtravStdy_3e.html

De Lollis, B. (2004, September 7). Talking heads are catching on as Web meetings take off. USA TODAY. http://www.usatoday.com/money/biztravel/2004-09-07-conferencing_x.htm

Fact sheet: U.S. Hotel industry & record profits http://72.14.253.104/search?q=cache:ec7xQnsiWBUJ:www.hotelworkersrising.org/media/RecordProfitsFactSheet.pdf+%22hotel+industry%22+%22occupancy+rate%22&hl=en&gl=us&ct=clnk&cd=16

Subcommittee on aviation hearing on commercial jet fuel supply: Impact and cost on the U.S. airline industry. http://www.house.gov/transportation/aviation/02-15-06/02-15-06memo.html