Good Day for an American teenager, who has been offered a free flight from Chicago to Cologne by British Airways to enable her to buy a pet guinea pig. This will replace her previous guinea pig which was crushed to death when a suitcase fell on its cage in the cargo hold of an earlier British Airways flight.

Bad Day for Sheikh Hamad Bin Hamdan Al-Nahayan, of the United Arab Emirates, whose 661/2-foot car has been judged 18 inches too long by the California Highway Patrol. The car, which seats 36, is equipped with cellular telephones, television sets, love seats, two fax machines and a microwave oven.