Per PX4 documentation:
Airspeed sensors are highly recommended for fixed-wing and VTOL frames. They are so important because the autopilot does not have other means to detect stall. For fixed-wing flight it is the airspeed that guarantees lift not ground speed!
While doing the research, consider the pressure and speed the sensor will be subjected to during flight. Compatibility with our flight controller is crucial as well. SPI/UART/I2C is acceptable for comm link. Ensure driver availability by checking PX4 repository or manufacturer support.
September 17th, 2020