There are overbought stocks, and then there's Delta Air Lines .
A stock is considered overbought if its 14-day RSI goes above 70, signaling investors should consider easing their exposure.
A 14-day RSI under 30, however, signals that a stock is oversold, meaning there may be a buying opportunity.
Take a look at the most overbought stocks in the S & P 500 .
Earlier this month, shares got a boost on news that General Motors will use Tesla's electric vehicle charging network .
Persons:
Tesla, Bernstein's Toni Sacconaghi, Sacconaghi, Ford's, downgrades, Campbell, Campbell Soup, Mills, Kraft Heinz, — CNBC's Michael Bloom
Organizations:
Delta Air Lines, Delta, Retail, Walmart, Ford, American Airlines, Netflix, Cruise, Parts, Dollar, SolarEdge Technologies, Kraft