LYON, France—Dassault Aviation’s order and delivery numbers for 2017 indicate Falcon business jet sales have stopped sliding. Orders increased to 41, up from 33, and three Falcon 5Xs were cancelled. In deliveries, the 2017 tally is stable at 49, up from a forecast of 45. Although those numbers can be seen as an improvement, handovers are still at their lowest level in two decades. Moreover, the backlog has decreased from 63 to 52. Some Falcon 5X cancellations have yet to be ...