Here's an article about using the MacBook Air as an integral part of a pro photographer's workflow.
MacBook Air advantages, compares to iPad
http://www.macworld.com/article/158047/2011/02/mbaforphotographers.html
The author also has a suggested workflow for the iPad here
http://www.macworld.com/article/151911/2010/06/cameraconnection_workflow.html
While the iPad has advantages in size and weight compared to the MacBook Air, it's not the best choice if you need to make a finished product while traveling. The Air has the processing power to run standard photography software (Photoshop, Aperture etc), in a very portable package.
MacBook Air advantages, compares to iPad
http://www.macworld.com/article/158047/2011/02/mbaforphotographers.html
The author also has a suggested workflow for the iPad here
http://www.macworld.com/article/151911/2010/06/cameraconnection_workflow.html
While the iPad has advantages in size and weight compared to the MacBook Air, it's not the best choice if you need to make a finished product while traveling. The Air has the processing power to run standard photography software (Photoshop, Aperture etc), in a very portable package.