alcoa corp aa stock dropped more than 2 in the extended session wednesday after the aluminum and alumina producer swung to a surprise quarterly loss and revenue came in below wall street expectations alcoa lost 231 million or 130 a share in the first quarter contrasting with earnings of 469 million or 249 a share in the yearago quarter adjusted for onetime items the company lost 23 cents a share revenue dropped to 27 billion from 33 billion a year ago analysts polled by factset expected adjusted earnings of 3 cents a share on sales of 276 billion alcoa is making “important progress in stabilizing our operations with teams working to improve on a minutebyminute daybyday basis” chief executive roy harvey said in a statement “we plan to build on that momentum as we tackle a host of complex issues including developing breakthrough technologies and addressing increased expectations from stakeholders” alcoa shares ended the regular trading day down 22