It marked the second month this year in which Boeing received no orders, a fate that would have seemed impossible not long ago.
Boeing also indicated Tuesday that it is no longer certain about completing orders for another 101 planes and dropped them from its backlog, which dropped below 5,000 for the first time since 2013.
Airbus said it received orders for nine planes in April, bringing its 2020 total to 299 planes after cancellations. The European plane maker said its backlog was 7,645 jets.
The COVID-19 outbreak has caused global air traffic to plummet and compounded a crisis at Boeing Co. that began with two fatal crashes and the grounding of its best-selling plane, the 737 Max.