I think that the A-10 is an irreplaceable aircraft.
Irreplaceable for what mission?
Killing tanks when we own the skies? OK, sure. It has a big gun. More efficient at killing tanks. When there are huge columns of armor, and no enemy fighters, then I want an A-10.
What else can it do, that other airplanes cannot?
Every other weapon that the A-10 can carry can be carried by the F-16, or better, the F-15E. Faster, able to fight, able to deliver the weapon sooner to the troops in contact.
Here is a short list of what the A-10 cannot do:
1. Defend itself
2. Take off from a short field with a full weapons load
3. Climb to a medium altitude with a weapons load
4. Go fast
5. Go far
So, for Ukraine? A horrible choice. We send them A-10s, and within a week, the Russians have a dozen new aces in their pilot ranks, and the Ukrainians have no more A-10s.
It’s a sitting duck against a fighter. It flows lower, and slower, than a commercial airliner, and heres the best part: it can’t shoot back. Sure, it can carry AIM-9, but it can’t actually use them against a wily fighter pilot.
You are low and slow in your A-10. A fighter shows up, sees you on radar. You know he’s there, from your ECM, but you can’t see him, because he chooses the terms of the engagement. He stays high, fast, and kills you with a missile while you are still looking.
Please don’t bring up the tired, “A-10s have been hit by a missile and made it home.” They were hit by MANPADS. Shoulder fired. SA-7/14 or Stinger. A short range, low speed missile with a small warhead. Hit the A-10 with a real air to air weapon, with a much larger warhead, guided to a greater degree of accuracy, and it’s dead. Every time.
If you Google my username, A-10, and this site, you’ll get a lot of hits on this discussion.
Troops love the A-10, because it flies so low and slow that they can see it. But it’s not even the best CAS platform, and choosing an airplane simply because people who know nothing about airplanes love it should give one pause.
Other platforms offer equal or better payload, much better range, better speed, and can be flexed into different roles. As a mission planner, the A-10 is at the bottom of my list. As a fighter pilot, fighting an A-10 is boring. It’s an easy kill.