Airvana

Airvana Congratulates Alaska Communications Systems’ Launch of 1xEV-DO Network

High-speed 3G Network Will Provide Alaskan Subscribers With Broadband Mobile Data Services

Chelmsford, MA, July 19, 2004 —  Airvana, Inc. (www.airvananet.com), a provider of All- IP, third-generation (3G) CDMA2000 1xEV-DO infrastructure, today congratulated Alaska Communications Systems Group, Inc. (ACS) (NASDAQ: ALSK), the leading integrated communications provider in Alaska, on its launch of a 1xEV-DO next generation wireless data network. The service is now available for subscribers in Anchorage, Fairbanks and Juneau.

Airvana supplied ACS with 1xEV-DO Radio Access Network Infrastructure including its IP-RN 8000 radio nodes, the IP-RNC Radio Network Controller and the AirVista™ Web-Based Management System to provide high-speed wireless data capabilities to fixed and mobile devices. Airvana’s All-IP CDMA2000 1xEV-DO infrastructure enables carriers to deliver “always on” mobile wireless services over wireless networks at broadband speeds, and at a lower cost per bit than any other 3G technology.

“The new 1xEV-DO service will provide enterprise customers with ubiquitous wireless connectivity at broadband speeds and bring unmatched differentiation to ACS’ wireless services,” said Sanjeev Verma, Co- founder and Vice President Marketing & Business Development for Airvana. “We congratulate ACS on their decision to deploy this advanced high-speed mobile technology.”

"Airvana’s technology was a key component to the successful deployment of our CDMA network utilizing 1xEV-DO technology,” said Sheldon Fisher, SVP Sales and Marketing for ACS. "ACS' launch of 1xEVDO is proof that we are committed to leading the industry in the delivery of the best wireless data technology, with superior coverage and services – offering a combination of superior technology and value to our customers."

About Alaska Communications Systems Group, Inc.

ACS is the leading integrated communications provider in Alaska, offering local telephone service, wireless, long distance, data, entertainment and Internet services to business and residential customers throughout Alaska. Please visit us at www.acsalaska.com or investor information can be found at www.alsk.com.

Contact

Rob Morton
Davies Murphy Group
rmorton@daviesmurphy.com
(781) 418-2460