Boeing Co.’s orders and deliveries sank in the first quarter, with zero new orders for the 737 Max following a worldwide grounding in March in the wake of two fatal plane crashes.

The groundings forced Boeing to freeze deliveries of the Max, which had been its fastest-selling jetliner until a March 10 crash on Ethiopian Airlines that killed all 157 on board, just five months after a similar crash of a Lion Air jet that killed all 189 passengers and crew.

Total orders, an indication of future demand, fell to 95 aircraft in the first quarter from 180 a year earlier, suggesting a wait-and-watch approach for airlines as Boeing rides out the worst crisis in its history.