We took the 'Fly the Drake' expedition, flying from Punta Arenas to King George Island. The flight was on Antarctica Airways, a 4-engine jet that landed on a gravel runway. The flight both ways was smooth. On board food were prepared sandwiches and other snacks. Very filling but - you should refrain from filling up since lunch will be available once you board the Ocean Adventurer.
The initial plan was to walk about 2 kilometers from the runway to where the zodiacs were on the beach. A new process now includes minibuses that transported you there and back on the return leg.
The Ocean Adventurer is an older vessel that has been refurbished. Everything was clean, functional, and comfortable. The ships crew was "invisible" but you can tell that they worked hard to make the sailings smooth.