PS GROUP <PSG>, USAIR <U> MOVE UP DEADLINE PS Group Inc said it and USAir Group agreed to move up the completion date of USAir's acquisition of Pacific Southwest Airlines to April 30 from September 30 originally. If the acquisition does not take place by April 30, either party may terminate the agreement, the company said. The deadline has been moved up because the Department of Transportation and PS Group shareholders have already approved the transaction, the company said. A Teamsters Union agreement to certain labor contract conditions remains to be resolved under the pact.