Not necessarily, instead of dragging your luggage with you on the train from HK or Kowloon back to the airport you can check it and check in, in town. Then just ride the train to the terminal, pass through immigration, security and go to your gate.

You will still have to take your luggage with you on the way to HK or Kowloon station from the airport.

The thing is you will have all day Saturday and you might as well enjoy HK a little bit. I don't recall the two airport hotels (Marriott and a Regal) being any cheaper than something in Kowloon.

Here is info on the airport express: http://www.hongkongairport.com/eng/t...t-express.html

Seems like you have the flights lined up. Only suggestion would be to sign up for expert flyer so you can get notified when R opens up and book your tickets then.