They have both a good friend flys there the 40xr and the 45xr same type only 2 feet shorter and to less sets and a little less fuel .you can tell a flexjet 40 for a 45 by the tail number the 45 all start with EXAMPLE N422FX AND THE 40 STARTS WTIH N604FX SO THE #4 FOR 45 AND THE#6 FOR THE 40 GOOD LUCK OVER THERE GREAT GROUP OF PEOPLE TO WORK FOR