4 API credits for tracking a specific icao24 code?

Hi, looking at the breakdown of how credits are used it follows the pattern that the larger the area (lat/long bounding box) you query with the states api, the more credits it requires.  However, you can use the /states api for a specific flight by setting the icao24 code as a query param, which is separate from using lat/long coordinates.  For these calls, 4 credits are used. 

Is this intentional?  It "feels like" this should only be 1 credit since I'm not querying a geographic area at all, but rather a specific flight.  Just curious.  I'm working on a project where I intend to gather departures from an airport and then make repeated calls to the /states api for those departures to effectively track the entire flight from beginning to end.  4 credits for each call is going to put me over the limit very quickly! . Thanks,