According to MacRumors, a 15″ MacBook Air may be in the works. It’s unsure whether or not the source has received new information or is just rehashing on previous rumors, but either way I think it’s a safe bet that a larger screen size certainly wouldn’t hurt. With 11″ and 13″ being the only options available for the Air right now, it almost seems like nothing more than Apple’s take on the netbook, considering that the majority of Mac users are using the machine for graphic, audio, and video editing. I have enough trouble trying to use Logic or Pro Tools with a 15″ screen, so I can’t imagine what that would be like on an 11 or a 13.