The Civil Aeronautics Board has decided to give Braniff International and two charter airlines -- World Airways and Trans International Airlines -- authority to begin new scheduled air services to Europe.

According to agency officials, Braniff will be given new routes from Boston, Dallas/Ft. Worth and Detroit to Paris, Brussels and Amsterdam. World gets a new route from Los Angeles to Amsterdam, and TIA is granted the authority to fly from Bangor, Maine, New York, Los Angeles and Oakland to Paris and Amsterdam.

The route awards, made under the board's exemption authority, allow the airlines to step in and serve some of the routes Pan American World Airways recently dropped and also take advantage of liberalized air agreements recently signed with The Netherlands and Belgium allowing the U.S. to designate to the two countries as many airlines as it wishes.

The decision also adds to routes to Belgium and The Netherlands granted in September to two scheduled and two charter airlines. Under that grant, National Airlines will be starting service to Amsterdam from New York this month.

The board's new route decisions were made at a meeting closed to the public because members would be discussing sensitive international negotiations. The formal order will be released sometime next week.

During its deliberations, the board put off action on applications filed by various airlines to fly to Germany in light of a recently signed agreement giving the U.S. the right to name more airlines to fly to German cities. The board said it was disposed to grant such applications, but invited others airlines to apply for the new authority. The board set Dec. 21 as a tentative target date for granting new German authority.

In another action, the board adopted a program to finance public participation in board proceedings. Although it noted that the public always has had the right to participate, the cost of time required made it difficult for all but those that had an immediate financial interest -- airlines and the localities primiarly.

Under the program the board adopted, groups that want to participate in a board proceeding may immediately apply for financial assistance. Applications will be evaluated by a three-person panel on the basis of the group's financial need, a comparison of its financial interest in the outcome of the case with the burdens of the participation, and the applicant's potential contribution to the case.

Congress appropriated $150,000 specifically for the program.

In yet another action, the CAB adopted a "lottery" procedure for processing competing applications for future "unused" routes that in the future will eliminate the necessity of the long line of airline representatives that graced Connecticut Avenue in October.

The airlines were seeking to put in applications to get unused routes of other airlines that were available on a first-come, first-served basis under the Airline Deregulation Act.

The CAB noted with some distress that the original queue system it used could have resulted in a "perpetual" queue outside the board's offices, since routes will become dormant and available to others if airlines fail to serve them in an outgoing manner.