Shim,
I gig daily, often multiple times a day with my Tyros 4. I don't fly on planes with it. But, it fits nicely in my car and is easy handle. I use a Rock-N-Roll Cart for all my equipment and it is a one trip in and out event.
I doubt you are going to find any of the TOTL arranger any lighter or at least enough so to make a real difference.
Deane