Not getting a schedule for ASL Airlines for Southend Airport from AirlineFlightSchedules method

Not getting a schedule for ASL Airlines for Southend Airport from AirlineFlightSchedules method.
Reference link is below.

https://flightxml.flightaware.com/json/FlightXML3/AirlineFlightSchedules?start_date=1604275200&end_date=1605830400&destination=SEN&airline=ABR&howMany=150&exclude_codeshare=True

But getting the flights from AirportBoards method for the same ASL Airlines / Southend Airport.
Reference link is below.
https://flightxml.flightaware.com/json/FlightXML3/AirportBoards?airport_code=SEN&filter=airline:ABR&howMany=150

Kindly, Update the reason why the schedule is not coming from AirlineFlightSchedules method for ASL Airlines.

Unfortunately, not all airlines participate in the data service that publishes their schedules into the AirlineFlightSchedules, particularly smaller or budget airlines.

ASL Airlines is a cargo operator. We typically do not have access to schedules for cargo airlines.

ASL flights have been in the schedule for the last 12months and we’d like to understand why they stopped.

Our records indicate we have never had schedules for ASL Airlines Ireland (ABR).

Keep in mind that ASL Airlines operates as multiple country-specific identities including ASL Airlines Belgium (TAY/3V), France (FPO/5O), and Hungary (FAH). Are you perhaps thinking of one of those? (we do seem to have schedules for 3V and 5O)

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Is there any way we can add ASL flights to AirlineFlightSchedules method as we’ve in AirportBoards method.

That is not within our power to do so. They must opt to transmit their schedule information to the industry-established schedule publishing service.