TRANS WORLD AIRLINES <TWA> FILES ON USAIR <U> Trans World Airlines said it told the Securities and Exchange Commission it does not intend to seek control of USAir Group or to acquire more of its stock at this time. TWA also said it is amending its application with the Department of Transportation to seek control of USAir. The amendment said TWA reserves the right to seek control of USAir in the future, that it intends to maintain its 15 pct stake, and that it also is seeking the flexibility to acquire up to 25 pct of USAir. TWA said all USAir stock owned by it would be in a voting trust and voted in the same proportion as the vote of all other USAir shareholders. TWA filed a 13-D with the Securities and Exchange Commission, reporting its holding of 4,023,200 shares of USAir. TWA has said the stake amounts to about 15 pct. TWA also said that by order of the federal court in Pittsburgh, it is temporarily barred from buying additional shares of USAir pending a hearing March 23 to reconsider USAir's application to expand the temporary restraining order to a preliminary injunction.