The US company SpaceX on Wednesday said it was unlikely to meet a planned May 7 launch to send its Dragon space capsule to the International Space Station, but did not set a new date for the attempt. "At this time, a May 7th launch appears unlikely," spokeswoman Kirstin Grantham said in a statement. "SpaceX is continuing to work through the software assurance process with NASA. We will issue a statement as soon as a new launch target is set." …