The Global Business Travel Association (GBTA) released its first Business Traveler Sentiment Index, which discovered business travelers' attitudes toward five components of business-related travel, including overall trip experience; travel management policies; expense tracking and management; safety; and social media experience.

When it comes to transportation, the report found that millennials are more interested than travelers of other ages in ride-share services. Additionally, they are more likely to use social media for business travel, with approximately 50% of those ages 18 to 34 saying they use it to review travel suppliers, compared with roughly 40% or less of business travelers in other age groups.

Another finding revealed that 86% of travelers said free access to Wi-Fi is one of the top items travelers believe all airlines should offer.

"The Index identifies the greatest pain points for business travelers, indicating to organizations which areas to target for improvement," said Susan Chapman-Hughes, senior vice president at American Express Global Corporate Payments. "In the area of expense management, for example, companies would be wise to invest resources into mobile apps and expense management solutions to help business travelers save time and be more productive."

The GBTA Business Traveler Sentiment Index was conducted Dec. 4-19, 2014 with business travelers within the U.S. through an online research panel. Interviewees included 826 respondents whose primary residence is located in the United States; are employed part- or full-time; and have taken four or more business trips in the past 12 months.