U.S. stock futures point lower to end the week; FedEx ( FDX ) shares are tumbling in premarket trading after the shipping company lowers its sales outlook; Nike ( NKE ) shares are dropping as the sneaker giant warns of weakening sales; Micron Technology ( MU ) shares are falling despite the tech firm's better-than-expected results; and global air traffic is disrupted as London's Heathrow Airport shuts for the day after a nearby fire causes a power outage. Here's what investors need to know today.

1. US Stock Futures Point Lower to End Week

U.S. stock futures are pointing lower to end the week. S&P 500 and Dow Jones Industrial Average futures are 0.3% lower after the indexes posted modest declines yesterday, though both are on pace to close higher for the week. Nasdaq futures are down 0.4% and the index is lower by a similar percentage for the week through Thursday as it looks to snap a four-week skid. Bitcoin ( BTCUSD ) is moving lower to trade at around $84,000, while yields on the 10-year Treasury note are slipping to just over 4.2%. Oil and gold futures are declining.

2. FedEx Stock Dives on Disappointing Q3 Profit, Revenue Outlook

FedEx ( FDX ) shares are tumbling 8% in premarket trading after the shipping giant reported quarterly profit that missed expectations while also lowering its full-year outlook. The company said it expects full-year revenue to come in slightly lower to flat year-over-year, worse than its prior forecast of "approximately flat." FedEx also lowered its profit outlook for a third straight quarter. For its fiscal third quarter, FedEx's adjusted earnings per share (EPS) of $4.51 came up short of Visible Alpha estimates, although its revenue of $22.2 billion topped them.

3. Nike Stock Drops on Sales Warning

Nike ( NKE ) shares are sinking 6% in premarket trading after the sneaker giant warned that sales could weaken under the company's turnaround plan , with new tariffs adding to uncertainty . Nike CFO Matt Friend told investors that its current-quarter sales are expected to drop by a percentage in the low end of the "mid-teens range," according to an earnings call transcript provided by AlphaSense, while Visible Alpha estimates were for a 12% decline. Nike shares have declined about 30% over the past 12 months.

4. Micron Technology Stock Dips Despite Better-Than-Expected Results, Outlook

Micron Technology ( MU ) shares are 3.5% lower in premarket trading even though the tech firm reported better-than-expected results and issued optimistic guidance. The chipmaker's fiscal second-quarter adjusted EPS of $1.56 and revenue of $8.05 billion topped Visible Alpha consensus, as data center sales tripled year-over-year, driven by strong demand for artificial intelligence . Micron's current-quarter adjusted EPS and revenue outlooks also were better than estimated.