Ridden Atlas air three times (interestingly it was the same N# all three times). Once from Hong Kong to Anchorage, and twice from Luxembourg to Huntsville. A VERY, VERY nice way to travel IMHO and highly recommend considering using them. The crews have all been great. Every time I have ridden they have an abundance of food stocked (the crew will show you how to heat the food up if you don't know). All three times they had three person crew, so I ended up getting one of the two bunks all to myself while the crew rotated through the other bunk. The configuration was four older style first class seats and then the two bunks behind them. Rode up front for takeoff and landing just because I wanted to see it from the cockpit of the whale, but you can ride in the regular seats.

Do not know how it is for most other airports, but in HKG and LUX you meet the crew at the passenger terminal. The paperwork will have your name and information on it and they will tell you where to meet the crew and what time. In HKG it was at the central information desk, in LUX it was right by security. After verifying your ID/Passport, you are escorted through security and and taken to the crew van for the ride over to the cargo area. Suitcase was left by the aircraft stairs with the rest of the crew luggage and it gets loaded down below, so you don't have to haul it all the way up to the upper deck.

Anyway, Atlas is a great option and I have always enjoyed using them.