After a recent rally, Archer Aviation stock is heading lower today. Is this a good opportunity to buy shares?Archer Aviation (ACHR -10.94%) stock is losing ground in Wednesday's trading after the company revealed that it plans to sell more stock. The flying taxi specialist's share price was down 9.1% at 3 p.m. ET.Archer Aviation published a filing with the Securities and Exchange Commission (SEC) today detailing plans to sell up to $70 million in new stock. The creation and sale of new stock will mean that ...