For international travel, the Airbus A350-1000 will be acquired. With this in mind, there will only be a handful of such aircraft due to the expense, and the fact that they will not be able to fly to the regional airports. This means they are stuck at the Kaldus International Airport, and any visiting airports. The aircraft will be designed to carry a lot of people, and with just a couple of classes with the majority of seats in economy class.
In addition to the long haul aircraft that would be purchased by Kaldus Air, the royal international aircraft will also be an Airbus A350-1000. This is intended to keep the number of aircrafts that have to be catered to a minimum. Any pilot should be able to board a long haul aircraft, and be familiar with the layout. If another aircraft was used, then there will need to be adjustments in how many aircraft are to be taught. The selection of a single aircraft for long haul aircraft is what many airlines do anyways, so this is not much of an issue.