Surf Air Mobility stock (NYSE:SRFM) has almost doubled over the last five trading days, rising to about $7.60 per share. So what’s driving the surge? The gains come after AI and big data software major Palantir increased its stake in Surf Air to almost 20%, up from 10% a year ago, combining equity-for-services and direct purchases. This apparently added to investor confidence in the small cap stock which has a market cap of about $300 million, currently. Surf Air derives a bulk of its revenue from its sched ...