Diameter's @plan Advertising Summer 2001 Report Reveals Over 37 Million Internet Users Purchased Travel Online

According to the @plan data, when asked which types of Web sites, if any, the participants had visited for shopping or purchasing of vacation packages, 32% of 25-34 year-olds went online to purchase within the online travel category compared with for example, 55 year-olds (25%) and with 18-24 year-olds (20%). Notably, the @plan data also highlights that the more than 56 million online reward program members purchased or reserved travel online 54 percent more than the average Internet user.(b)

"With the summer travel season beginning, our @plan data shows that there is a large online component to travel planning across all ages," said Doug Knopper, Vice President and General Manager for Diameter. "Whether planning or purchasing, Internet users who travel are making the Internet an essential part of their summer vacation plans."

Additionally, generations Y and X, baby boomers and the mature generation enjoy their vacations in different ways. According to the @plan data, when asked what type of vacations they had taken in the last two years, a surprising 13.3.% of matures stated that they favor casino gambling vacations compared to other age groups such as 35-44 year-olds, who prefer theme parks (25%), 18-24 year-olds who favor outfitter vacations (9.2%) and 25-34 year-olds who enjoyed all-inclusive resort vacations (7.5%).

"@plan shows us what travel specials consumers are looking for and what they purchase online," said Ralph Bartel, Chief Executive Officer of Travelzoo Inc. "As a result, we are able to enhance the performance of advertising campaigns for travel companies."

• (a) Generation Y refers to 18-24 year-olds, generation X to 25-34 year-olds, baby boomers to 35-54 year-olds and the mature generation to 55+ year-olds
• (b) Hotel and airline category reward programs have been covered

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Vacation Activities
(Last 2 years)              % All Internet  Age Group     % Age Group
                                 Users    Concentration
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Beach                             33.0        35-44            36.8
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Theme parks Vacation              17.9        35-44            24.6
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National Park Visit               14.4        45-54            15.7
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Cultural/Historic Sites           14.1        45-54; 55+       17.2
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Casino Gambling Vacation          13.3           55+           15.3
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Museums                            8.7        45-54             9.9
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Cruise Ship Vacation               8.2           55+           14.4
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Fishing Vacation                   7.8        45-54             8.6
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Skiing Vacation                    7.7        18-24            10.7
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Outfitter Vacation                 6.1        18-24             9.2
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All-inclusive resort               6.0        25-34             7.5
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Water sports Vacation              5.6        35-44             6.5
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Golf Vacation                      5.2           55+            7.2
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Packaged/Guided Tour               3.7           55+            8.7
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Hunting Vacation                   3.5        35-44             3.8
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Resort/Spa                         3.3        35-44             4.0
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Adult Educational Retreat          2.9           55+            3.8
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Major Sporting Event               2.7        18-24             3.7
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Any Online Travel Purchase (last 6 months)               % Age Group
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18-24                                                           20.5
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25-34                                                           32.4
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35-44                                                           28.6
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45-54                                                           31.1
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55+                                                             25.0
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Average Internet User                                           28.3
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Diameter's @plan Advertising is built from survey research with 40,000 active adult users of the Internet. Active adults users of the Internet were defined as those U.S. adults, age 18 and older, who have visited sites on the Web in the previous 30 days. The Summer 2001 field dates are taken from April 3, 2000 through March 30, 2001 data. The study measures all U.S. web usage, whether occurring at work, home, school or elsewhere. The research measures site usage, demographics, lifestyle characteristics and brand and product preferences for selected product categories. Currently over 550 clients use Diameter's @plan Advertising including America Online, Microsoft, , and CNN Interactive. @plan uses The Gallup Organization, one of the premier marketing research organizations worldwide, to conduct all @plan survey research.

Diameter's @plan Advertising provides Internet advertisers and Web publishers access to rich data, which is updated quarterly, to effectively target online campaigns and understand consumer behavior online.

For more information on Diameter's @plan Advertising, visit www.diameter.net

About Diameter

Diameter, a division of DoubleClick Inc., leverages the company's experience in developing new technologies to harness the power of new media. Diameter is a complete suite of research tools, offering media intelligence tools, audience measurement, and advertising effectiveness products. Providing a richer understanding of online behavior, purchasing patterns, and detailed analyses of online campaigns, Diameter offers both pre-campaign as well as post-campaign analysis tools that give advertisers, brand marketers and e-businesses a more complete understanding of the online world. With sound methodology, Diameter allows for a new way to plan and evaluate online campaigns and strategies.

About DoubleClick

DoubleClick is building the infrastructure that makes marketing work in the digital world. Combining media, data, research, and technology expertise, DoubleClick allows marketers to deliver the right message, to the right person, at the right time, while helping Web publishers maximize their revenue and build their business online. DoubleClick, Inc. has Global headquarters in New York City and maintains over 40 offices around the world.