Northwest Airlines pilots ratified a tentative contract...

Northwest Airlines pilots ratified a tentative contract offer from parent NWA Inc. that ends 2 1/2 years of negotiations, the Air Line Pilots Assn. said . . . The Federal Reserve said the average yield for one-year T-bills, the most popular index for making changes in adjustable-rate mortgages, rose to 8.30% last week, up from 8.12% the week before.