Sort-of; it's really the TAMDAR [1] system taking measurements of humidity and temperature that are readily assimilated into the global forecast models run by all of the major weather forecast centers (NOAA, UKMO, ECMWF, etc). These observations play a non-trivial role in improving the assimilated initial conditions and boosting forecast quality. Recent work [e.g. 2] has demonstrated that the degradation in availability of aircraft-based observations during the pandemic likely did produce a real, statistically significant decrease in average forecast skill during the afflicted time periods.
[1]: https://www.nasa.gov/vision/earth/environment/2006ams_TAMDAR... [2]: https://journals.ametsoc.org/view/journals/apme/59/11/JAMC-D...