Support for use Flightaware API

Hello guys,

We are testing the Flightaware API through the C # language for VS,

and this error does not allow us to continue with the tests.

WaitingForActivation is an indication from the .NET runtime that your async call is still running and you need to use await until the response is ready. Please refer to standard CLR/.NET documentation about async/await functions, since this topic is not specific to our server-side implementation.

var AllAirlines = await client.AllAirportsAsync();