We cannot schedule a pickup or drop off for a location that does not return a zip code from the Google Place API results. Some airport results are returned with no zip code, but as far as we can tell there is always another airport result returned that does have a zip code, usually the second location listed. If this is your situation, please select the result that has a zip code associated with it. This issue affects both iOS and Android. We are looking into ways to resolve this problem.