By Medha Singh (Reuters) – U.S. stock index futures slumped on Friday, with travel, bank and commodity-linked stocks bearing the brunt of the selloff, as the discovery of a new and possibly vaccine-resistant coronavirus variant spooked investors ahead of a short trading session. Stocks of major airline operators dropped between 5% and 6% in premarket trading, as the new variant detected in South Africa prompted the European Union, Britain and India among others to announce stricter border controls. Cruise operators Carnival Corp and Royal Caribbean Cruises plunged about 9% each. Bank of Americ…

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