Agreed I was glad to see that in an actual SEC filing as well. And as we know since then Facebook as abandoned building the drones but not the project and would continue to work with others on network development!
Laser communication in space
In June 2018, Facebook's Connectivity Lab (related to Facebook Aquila) was reported to have achieved a bidirectional 10 Gbit/s air-to-ground connection in collaboration with Mynaric, the tests were carried out from a conventional Cessna aircraft in 9km distance to the optical ground station. While the test scenario had worse platform vibrations, atmospheric turbulence and angular velocity profiles than a stratospheric target platform the uplink worked flawlessly and achieved 100% throughput at all times, the downlink throughput occasionally dropped to about 96% due to a non-ideal software parameter which was said to be easily fixed.[21]