Careful planning. It's useful whether you are building large systems, or whether you are moving house.
I need to move house today. And with a little planning I've established that my local (regional twin-prop) airline only charges $2 for oversized luggage, and has no limit on the quantity as long as there the plane stays within weight limits.
I've been fairly careful over the last 3 years here not to accumulate any possessions that are either very large or very heavy. And I'm moving at the weekly low point for passenger numbers.
So I have my office and most of my life (including, shortly after this point, my main computers) packed up as around 120 kilos of luggage, and for about $250 (including taxi fare from the airport) I can move house to a different city 800km away in about 3 hours from door to door.
Farewell Lismore, Sydney awaits!