Annapolis-based Aeronautical Radio Inc., which operates the nation's largest aeronautical communications system, plans to build a more advanced network to serve the commercial aviation system beginning in 1992.

After the system is completed, it will be one of the most technologically sophisticated networks of its type in the world, the company said last week.

"It will have many new features ... that will make it faster, cheaper and the like," said company spokesman Daniel Sassi.

The company's network now deals with more than 6 million messages daily in support of flight operations, travel reservation services and financial data base activities for major credit card providers.

The new system will be able to handle about twice the volume of data and voice traffic as the current network.

The Lanman Companies Inc. of Washington acquired Tampa-based Sun Group, a desktop publishing training and systems integrator, for an undisclosed amount. Sun Group will become a division of Justin Associates Ltd. of Washington, a Lanman subsidiary that provides consulting and training in the desktop publishing field.

Kerns Group Architects P.C. of Washington was awarded contracts to design a $11 million multi-purpose building in Arlington for the Navy Mutual Aid Association-U.S. Marine Corps and to do the interior renovation of more than 90,000 square feet for Mobil Oil Corp.'s headquarters in Fairfax.

Hospitality Services Inc. of Baltimore was awarded a contract by Ayers/Saint/Gross Architects of Baltimore to program and design a food-service center for the Owings Mills headquarters of the Baltimore Life Insurance Co.

Gray Kirk and Evans of Baltimore was awarded the advertising contract for Utz Quality Foods Inc. of Hanover, Pa.

The Center for Industry Cooperation and Trade, a Fairfax-based international business development firm, entered a joint venture with HNS Ltd. of Hungary to develop high technology business opportunities in the United States and Eastern Europe.

Montrose, Greenhill & Player Direct Marketing of Bowie was awarded a contract by St. Anthony Hospital Publications of Alexandria.

Steve Ellis Communications of Washington was awarded a contract by Scott Worldwide Foodservice, a unit of the Scott Paper Co. of Philadelphia, to provide communications consultation on environmental issues.

The consulting division of Sargis & Jones of Arlington was awarded a contract by the National Cable Television Association of Washington to provide construction management services for the rehabilitation and expansion of its Washington offices.

Drew Babb Creative Services of Alexandria was awarded advertising contracts by Home Recording Rights Coalition of Washington, Wolf Trap Farm Park and KLM Video of Bethesda.

Edward Segal Communications opened in Washington.

A.J. Burton Group Inc., a banking recruitment and placement firm, opened in Baltimore.

RGC/Hagler, Bailly Inc. of Washington opened an office in San Francisco.

The American Association of Parents and Children opened in Herndon.

Announcements of news and developments affecting Washington area companies should be sent to Regional Report, Business News Department, The Washington Post, 1150 15th St. NW, Washington, D.C. 20071.