Shares in Boeing Co. dropped more than 13 percent Thursday on concerns that sweeping US travel restrictions on Europe, meant to curb the spreading coronavirus, will hurt the planemaker’s airline customers.

The 30-day travel restrictions, announced by President Trump on Wednesday, are expected to deepen financial misery for airlines, which are likely to defer or cancel jet deliveries, Boeing’s main source of cash.

“Airlines are in cash preservation mode,” Cowen analyst Helane Becker said.

Boeing itself is fighting to preserve cash as the coronavirus outbreak compounds fallout from a year-old grounding of its 737 MAX.

JPMorgan cut its long-term “overweight” rating on the planemaker’s shares. The stock has lost more than half of its value from a year ago, when a global 737 MAX grounding sparked by a second fatal crash hit investor sentiment.