Dear API implementer,
Due to major improvements to the infrastructure the v3 API will be deprecated on 01/SEP/2019 (Updated from 01/APR)
We have left most of the API the same, you can still use XML with most common used methods are still the same.
Also we are depreciating getFlights method from v4 and you will need to start working with getDeepLink method.
Please check the following link for the documentation of v4 API: The AeroCRS Developer Hub