GENEVA, May 12--The Big Four foreign ministers conference deadlocked today over a Soviet proposal to seat Communist Poland and Czechoslovakia as full participants.

The ministers wrangled inconclusively for more than an hour, then adjourned with the dispute unsettled. The Soviets announced they intend to bring up the issue again tomorrow

Two Capital Planes Crash

BALTIMORE, May 12--A big Capital Airlines New York-to-Atlanta Viscount plane with 27 passengers and a crew of four exploded in flight late tonight about 15 miles east of Baltimore. Twenty-nine bodies were recovered within two hours from the scattered debris.

And at Charleston, W. Va., about 450 miles to the west, another Capital Airlines four-engined plane from upper New York State and Pittsburgh also bound for Atlanta crashed while attempting to land. Two bodies were recovered from the wreckage and at least 13 were hospitalized.

Reid, Dillon Appointments Stymied

WASHINGTON, May 12--Democratic senators held up action on two diplomatic appointments yesterday in a caustic attack on the Eisenhower administration's foreign policy and its alleged suppression of information.

Several Democrats on the Senate Foreign Relations Committee also got to squabbling among themselves at a hearing on the nominations of C. Douglas Dillon to be chief assistant to the secretary of state, and Ogden R. Reid to be ambassador to Israel.

Britain Announces Satellite Plans

LONDON--Britain announced yesterday it intends to enter the space age by launching its own earth satellites.

Prime Minister Harold Macmillan announced that the rocket that will carry the first one aloft to join the U.S. and Soviet satellites has not yet been chosen.