Flights not returned by the api

FlightAware AeroAPI
1

I am making a query to the api (AirlineFlightSchedules) to return flights for a specific day, but some of the flights do not return the api, but if they appear on the website.

Some examples are

QL2966
AA1511

Does anyone know if it is normal that the query to the API does not return the same results as the website?

Thanks

2

AirlineFlightSchedules only returns flights that have been published by airlines in their monthly schedule listing. However, not all flights will always be in that listing and we may only receive notification of the flights from other sources, including from ATC or ADS-B.

This can happen with airline flights that have recently started a new route and have not yet had a chance to appear in their monthly publication, as looks like might be the case with those two flights.