The Federal Aviation Administration has issued a sharp warning that rocket launches could “significantly reduce safety” for airplanes, urging pilots to prepare for the possibility that “catastrophic failures” could create dangerous debris fields.

The official notice, known as a safety alert for operators, was dated Jan. 8, the same day that ProPublica published an investigation showing how pilots scrambled to avoid debris after two SpaceX Starship megarockets exploded over busy airspace last year. The alert was an acknowledgment that travelers were at risk on those days, when the FAA hastily activated no-fly zones to help air traffic controllers steer planes away from falling rocket parts.

In the last two decades, the agency has issued about 245 such safety alerts to the aviation community about issues ranging from runway threats to mechanical problems, but last month’s warning is the first to address the danger to airplanes when rockets launch or reenter Earth’s atmosphere, according to the FAA’s website.

SpaceX and other companies have ramped up launches in recent years. Starship, a version of which is supposed to one day land on the moon, has followed a flight path that soars over well-trafficked commercial airways in the Caribbean.