
Now boarding —
Inside each of these boxes -- or stalls -- there is a multi-million-dollar horse, preparing to fly from Amsterdam to Las Vegas. Here's how it works.

Defending champion —
Forty or so horses assembled at Amsterdam's Schiphol airport, cared for by 10 assistants, known as grooms. Grey gelding Cornet D'Amour, who won last year's Longines World Cup jumping final with Germany's Daniel Deusser, prepares to board.

Heart-to-heart —
Horses are supervised by a vet while loading takes place. These two are as good as horses get: on the left, showjumping World Cup champion Cornet D'Amour. On the right, dressage Olympic, world, European, and World Cup champion Valegro.

Pick a seat —
This is how it looks inside the Qatar Airways Boeing 777 that takes the horses to Vegas. They spend just over 11 hours in the air. All horses carry passports and each stall is security-checked before being loaded.

Undercover of darkness —
Dutch dressage rider Edward Gal's gelding, Glock's Undercover, is introduced to a stall ready for the flight. The full loading process takes around three-and-a-half hours.

Pre-flight snack —
Tim Dutta, whose company organizes air travel for horses, says some are accustomed to flying and others are more wary. Here, Swiss rider Martin Fuchs' horse -- PSG Future -- gets a treat from groom Emma Uusi Simola.

Ready to roll —
The flight's 'passengers' wait in line to board their B777. In total, 40 horses representing 17 nations will be on the flight.

Travel update —
Just like any flight, sometimes there's a little waiting around. Vanessa Ruiter, groom to gelding Glock's Undercover, updates rider Edward Gal's Facebook page while she waits.