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The developers are aware that there are many existing aircraft in the game that can mount the AIM-9L. However, at least initially, the missile will not be introduced en mass into the game and on every aircraft that could possibly carry it due to balancing concerns. Particularly top end aircraft that are already performing well for their current BR and that could also mount multiples (more than 2) of the missile. The introduction of AIM-9L would naturally have a serous impact on many existing aircrafts BRs also if it were to be introduced at this stage.
Therefore, while we are introducing these missiles to those aircraft on which no other missiles were installed (F-104S ASA, A-10), over time as we review the statistics of battles, it will then be decided on which aircraft to gradually introduce the missile too.