Wall Street was set to open slightly higher on Wednesday as new indications of coronavirus vaccine powered bets of quicker economic revival next year, while Boeing soared after it won US approval to resume flights of its 737 MAX jet.The planemaker’s shares leaped roughly 6.5% in premarket trading as it geared up to resume deliveries of the jet after a 20-month grounding following two fatal crashes.The news also heightened shares of airlines. American Airlines increased by 1.9% and Southwest Airlines added 2.5% as the carriers laid out plans to fly the aircraft again.Meanwhile, Pfizer Inc stated that it would apply for emergency Use authorization of its coronavirus vaccine within days and disclosed final results from a late-stage trial that indicated it was 95% effective. The drugmaker’s shares climbed 2.9%.