GetLastTrack billing issue

wI want to figure out how the GetLastTrack method is billed.
Is it according to the number of my requests, or the number of points in the data?
Can you tell me if anyone knows?

FlightXML billing is performed per “query”, which is one request with up to 15 records returned. Since GetLastTrack only returns the record from a single flight event each time it’s requested will result in one query being logged. The number of data points within the GetLastTrack response does not affect the number of queries counted.

19/5000

Zhēnshi tài gǎnxiè nínle, bāng wǒ gǎo míngbái
zhège wèntí.

Thank you so much, help me understand
this problem.