USAIR Group said it has completed the acquisition of Piedmont Aviation Inc. for about $1.6 billion . . . Dow Jones & Co. said its Ottaway Newspapers Inc. subsidiary agreed to buy Chapel Hill Newspaper of Chapel Hill, N.C., for an undisclosed amount . . . The Investment Company Institute reported that the assets of the nation's 412 money market mutual funds rose $2.45 billion to another record in the week ended Nov. 4 . . . American Airlines said it flew 4.77 billion revenue passenger miles last month, up 16.1% from a year earlier . . . Pan American World Airways reported that it flew flew 2.101 billion revenue passenger miles in October, up 23.7% over the same period a year ago.