Eleven spot bitcoin (BTC-USD) ETFs kicked off trading Thursday after securing approvals on Wednesday. Investors flocked to the new crypto offerings, driving $4.6 billion in volumes on opening day. Delta Air Lines (DAL) topped fourth-quarter earnings estimates but trimmed its 2024 profit guidance on the back of lingering cost pressures. Though Delta grew revenue 12% last quarter as travel rebounded, margins continue to suffer on high operating expenses. UnitedHealth Group (UNH) shares slipped as the healthcare giant reported a higher-than-forecasted medical loss ratio of 85% for the fourth-quarter, surpassing estimates for 83%. However, UnitedHealth reaffirmed its full-year 2024 outlook, though investors remain cautious on price trends. For more expert insight and the latest market action, click here to watch this full episode of Yahoo Finance Live. Editor's note: This article was written by Angel Smith.

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