The softening of demand that many business travel industry suppliers have been reporting in the past few months is in evidence in this annual effort to provide the business travel industry with meaningful benchmarks. Business Travel News, in its 21st annual Corporate Travel 100 issue, which offers a picture of previous year and current developments within the travel programs of the largest business travel spenders, shows only a slight increase in overall spending for 2007, from $10.8 billion in 2006 to $11.2 billion. The rankings here are based on air tickets bought in the United States going to anywhere. The overwhelming majority of companies on this list provided that information, as well as other details about preferred vendors, program accomplishments and goals and policy changes, through phone interviews and questionnaire responses. For companies that did not participate, BTN used many industry sources and published reports and gave companies the opportunity to improve the accuracy of listings in advance of publication