No Data being returned for these Flights below

Aviation
1

Hi we not getting flight details for a lot of fights like below ones which are not older than 2 weeks
Could you please confirm

https://flightxml.flightaware.com/json/FlightXML2/FlightInfoEx?ident%20=BR671&startDate%20=1589155200&endDate%20=1589328000&howMany=2

https://flightxml.flightaware.com/json/FlightXML2/FlightInfoEx?ident%20=5C9001&startDate%20=1589155200&endDate%20=1589328000&howMany=2

Thank you