If you positively have to have special delivery the next day, you may be out of luck. The U.S. Postal Service is moving the mail, but its all being done on the ground. Normally, the postal service contracts with commercial airliners to move the move more quickly, but since the FAA grounding of all flights, the mail is now moving by truck and rail instead. Meanwhile, FedEx Express is resuming air operations. The company is working toward resuming near normal operations tomorrow to the extent that safety precautions allow. The postal service will resume mail flights as soon as plane start flying their normal routes.