Greyhound freight from NYC to San Fran is $68 for a 60# 'box' I'm thinking about shipping my brew to the west coast for my yearly boat trip. I'll either rent a reg and tank, or go with the portable charger and a picnic tap.
Shipping it Greyhount takes 3 days, and you don't know the route. it could go through Texas, then Colorado, subjecting it to temp extremes.
I wouldn't do it for a contest, but beer for friends, sure thing.
I'll just bring the empty kegs back on the plane.