Investors may want to pay close attention to flying car stocks. If all goes according to plan, the market for flying car stocks could become a trillion-dollar opportunity according to JPMorgan. By 2040, it could be worth about $3 trillion as flying cars start to get into cargo and military operations. All as dozens of companies — from China to the U.S. and Europe — get flying cars off the ground. In the U.S., companies like Archer Aviation (NYSE:ACHR) are hoping to take to the skies in Santa Monica by 2025. ...