The issue with the PAF's F-16s aren't spare parts, but aircraft age. Our A/B airframes are reaching the end of their OEM-specified lifecycles, and there's no additional SLEP available for those specific aircraft. However, there's a 6,000 hour SLEP available for F-16C/Ds, so our Block-52+ can kick around for a while. Likewise, if the PAF can get used F-16C/Ds, they can apply the SLEP to those and keep them in the air for 15-20 years. Ideally, it could also apply an F-16V-type upgrade to around 54-72 F-16C/Ds (18 PAF birds plus 36-54 used C/Ds).
Unfortunately, Pakistan is in the darkest timeline in that the US isn't going to let a single one of these used or surplus airframes go to the PAF. Basically, think of the "easy, sensible solution" (like buying and upgrading used F-16s or C-130s), and now accept, "not going to happen." We're in
that situation. Uncle Sam has gone desi uncle on us
@JamD
If this predicament continues, then in time, the PAF's F-16C/Ds will be the only F-16s in service. By the 2040s, I'm sure the F-16A/Bs will be gone, especially if an NGFA comes online (e.g., the TFX, which Turkey is developing to replace the F-16). Tbh by that point, I'd just allocate all of the C/Ds to an elite DACT unit. The way the PAF is moving, unless an F-16V-type upgrade is available to us, the F-16s will be stone-walled from our next-gen interoperability stack, munitions stack, etc.