Wall Street set for gains at end of blistering week

(Reuters) - All three main U.S. stock indexes were on course to open higher on Friday in what is still the market's worst month in three decades, as intervention by U.S. policymakers finally seemed to stem the bleeding on Wall Street.Airlines including United Airlines Holdings , Delta Air Lines Inc and Wynn Resorts rose between 9% and 11% premarket, leading the charge in a sector that has lost more than half its value in the rout.Technology-focused heavyweights Microsoft , Intel also firmed..