Tesla's profits are under pressure

Tesla's earnings call was on Wednesday, a day after Elon Musk said on SpaceX's earnings call that he'd back a merger.Bloomberg/Getty ImagesTesla is facing some profitability headwinds.Its operating income fell 56% year over year as AI and research and development costs climbed.The company is still in the green, and it surprised earlier this month by delivering 486,532 vehicles in the third quarter.Tesla is still selling plenty of cars. Making the same amount of money on them is getting harder.On