USAIR <U> REPORTS FINAL PRORATION FACTOR
  USAir Group Inc said, in announcing
  the final proration factor for its tender offer for Piedmont
  Aviation Inc <PIE>, that 17.0 mln shares, or 90 pct of the
  shares were validly tendered.
      USAir said it has purchased and will pay for 9.3 mln
  shares, representing about 55 pct of those tendered.