We have traveled to high altitudes (think Utah or Colorado) from sea level without a problem; however, we have not rigorously tested the pump at high altitudes. It is always best to check your fluid level prior to each session and if you notice a drop in efficiency please follow the troubleshooting steps listed in the User Manual. We have read that air-based pumps can lose some suction strength at high altitudes, the Naya Smart Breast Pump is not air-based and doesn't seem to react the same way to high altitude. 

Many of our customers pump multiple times while in-flight without issues. When in doubt, we’re here for you! Just email us at support@nayahealth.com