I`m sure they want their money`s worth, but it doesn`t often happen that you keep on getting postponed after you have the TR. A bit strange, but we don`t know the details. Maybe you should ask them what`s the hold up? And, if they are reasonable people, you could ask if it`s ok with them if you do some freelance flying on the Kingair to get some hours and currency on it? And be ready when they call you in? You don`t have to appear to be a badguy at all, just curious and eager to get out of the blocks