Interesting scenario, like trying to figure out how to get to the desired result.
Israel- perhaps a worse Liberty incident makes it much more difficult for them to get all those F-4s and A-4s from US? Perhaps they will only get some F-5As and only some old Phantoms like say 36 F-4Cs like Spain, smaller numbers of A-4s, no Nickel Grass etc. Also maybe those Neshers, really just clandestinely delivered Mirage-5s, find another buyer, so IAF would be significantly weaker in 1973. Faced with the arab SAMs they would be even more crippled in the first few days. Without air superiority there is no Canal crossing and perhaps no retaking of Golan (let's assume the superpowers intervene to stop it getting nuclear). Conversely, perhaps saudi Lightnings and morroccan F-5s get to fight against Israel, also iirc Iraq was planning to buy 54 Mirages in 1968, if that happens a good chunk of those would be depolyed in Syria or Egypt in 1973.
Iran - could they get more clandestine support? Apparently there were plans to get F-4s and A-4s from Israel. Perhaps Saddam does something stupid to anger the West and/or the soviets (apparently the soviets were trying to court Iran), or maybe a coup gets rid of Khomeini and someone more moderate takes over, so Iran gets more support to cover most of their losses, spares especially but airframes too, say they get say 100 F-4, F-5 and A-4s from the west, and/or 100-120 or so MiG-23/25/Su-22 from USSR, and some 80 J-7s from China with western avionics, maybe even some french Mirages. Conversely Iraq might get less than what they received OTL. But the west would still not want Iran to outright win, they might end up the war still having a sizable chunk of iraqi territory though.
Vietnam- I know SV wanted Phantoms and A-4s or A-7s, lets suppose the US are more willing to prop them up so they gets to replace all their quite large numbers of old and/or unsuitable planes (A-1, A-37 etc.) with large numbers of more modern ones from US stocks, though even so i think due to NV tactics some kind of overt US intervention is still required to avoid the SV collapse.
Pakistan- Again looks to be a matter of more US support, if so iirc they wanted F-5s so they can get significant numbers before 1971, maybe more F-104s and more Mirages too, apparently PAF was short of planned strength, so more planes could remedy that and even increase it. This will make it significanly harder for the indians (and it will be one hell of an even fight between MiG-21 and F-5A/F-104A/Mirages), but i don't know enough about this particular conflict to say what could happen in East Pakistan for instance.