 sparks seen flying emergency crews racing in american airlines saying the plane experienced a mechanical issue and they're investigating the incident no injuries were reported abc's trevor alt two nasa astronauts are still at the international space station stuck there in a way even though they were supposed to be back here on earth weeks ago nasa astronauts butch wilmore and sonny williams eight-day test flight entering a second month while engineers on the ground investigate the cause of helium leaks and thruster problems