curl -X POST \
-d '{"origin": "LHR", "destination": "JFK", "departure_date": "2019-10-21"}' \
-H "content-type: application/json" \
https://interview.duffel.com/airline_a
curl -X POST \
-d '{"origin": "LHR", "destination": "JFK", "departure_date": "2019-10-21"}' \
-H "content-type: application/json" \
https://interview.duffel.com/airline_b