The heaviest volume was in put options that give the holders the right sell Delta shares at $50 each, after the stock price decline pushed the contracts closer to being in-the-money. More than 3,400 of those puts expiring tomorrow changed hands as of 11:12 a.m. in New York, exceeding the open interest of 2,560, exchange data tracked by moomoo showed. The price of that contract swung from as high as $1.10 to 26 cents.