I thought you might be interested to read this reply from TNA to my request for more information regarding release of AIR81 files.
"You are right to point out that there have not been any transfers into the AIR 81 series for some time and both The National Archives (TNA) and Ministry of Defence (MoD) are aware that the next transfers are overdue. Work is proceeding on further transfers but these transfers have taken longer to process than originally anticipated because of ongoing discussions between TNA and MoD over the cataloguing of the records. I am informed however that the next batch (AIR 81/1489-1779) are ready for transfer and we are hopeful that this transfer will have taken place by the end of next month. May I suggest therefore that you check Discovery for updates.
As regards the records for 1944 [my specific time frame of interest], these are still held by the Ministry of Defence and I am unable at present to estimate when they will be transferred to The National Archives.
I am sorry not to be able to give a more helpful response."
Such valuable information - just out of reach!