KLM is the only airline operating flights with a Boeing 747-combi. The advantage is that passengers can take their horses along as cargo in the same aircraft. There can be a maximum of seven stables on-board, in other words 20 horses (there may be only 2 horses in the last position because of the weight). All combi-flights are direct flights without any stopovers. This is the most ideal for horses, because the takeoff and landing are the most stressful times of the flight.
A second airline that HSI works with weekly, which is also a subsidiary of KLM, is Martinair Cargo. This company has years of experience in the field of horse transport and has strong routes to South America and the Middle East. Martinair flies horses for us to Miami.