In that case be done with it. Decline the voucher and submit a request for reimbursement of your expenses, e.g. the payment to the person who assisted you at home. Provide a receipt or other appropriate information along with your claim and be done with it.

Sorry OP Im at a loss to understand what it is exactly you want. In your title you wrote "Compensation" well then you said AA threw you a $350 voucher, from the sound of things that should have been more then what you paid out. Then you wrote but the voucher is good only on AA metal and most times you can purchase a tkt for less on another carrier or the tkt is being paid for by a 3rd party, since its work related

Bout the only thing I can suggest is write up a list of money that you laid out and tell AA to cancel the voucher and instead cut you a check for the expenses you laid out. So if your scooter was fixed for $0 thats what you are entitled to for getting it repaired, and the fact that it would have cost me say $400 is not important. time lost waiting to be taken from the plane = $0 and is apart of the voucher

Now if there are Federal laws dictating a monetary compensation for each thing you went thru thats something else

My only suggestion is to do like Ive done sworn off certain carriers even if their fare is alot cheaper, since when something hits the fan, theres no one home. As for the crew leaving you well could be they had other flights they had to catch and you said the SRO was there, so I dont blame the crew for going on their way

Im not blaming you and AA did drop the ball, I see Compensation as something to make me whole and not profit from so if your out of pocket expenses was say $50 thats what you are owed, you were asked a few times how much $$ you paid out and you never replied, I assume (maybe wrongly) it wasnt that much and alot less then the $350 voucher, so again tell AA to cancel the voucher and to cut a check for you out of pocket expenses and itemize them to AA

Important to remember that people tend to throw around the term "compensation" to cover compensation, reimbursement, and customer service gestures.
1. No compensation.
2. Yes out-of-pocket reimbursement for the money to hire assistance.
3. Customer service gesture in AA's sole discretion and $350 seems reasonable even if it isn't exactly what you want.

There is a law saying it is illegal to accidentally break something?

In any case, it seems you were
1. Delayed an hour getting the chair
2. Delayed another hour waiting for suitable transport.
(I didn't see in your comments what added up to 5 hours)
3. Had to pay someone to assist you from the transport to the door.
On the compensation issue. What, exactly, are you asking for?
How much did number 3 cost, and what are you valuing your time at for those 2 hours?

There were no actual expenses to the OP from what I can see, other than to hire someone to meet him at his house to get from the transport to the door. So, I am unclear what the insurance would have to do with it

There is a regulation requiring airlines to compensate lost, damaged or delayed property (14 CFR §254.4) and a special exception for wheelchairs and assistive devices which removes any cap on liability (14 CFR §382.131). §382.125 addresses OP's point about returning the mobility device as close to the aircraft door as possible. As someone who has to live with mobility impairment, it's not surprising that OP is significantly better informed than some others in this thread who feel a need to weigh in.

OP, you have my sympathies. Best of luck getting the appropriate compensation.

OP has made it clear that whatever was wrong with her rental, it was fixed at no charge by the rental company.

My point was it is NOT illegal to accidentally damage a wheelchair.
It would be illegal to accidentally damage it and not pay to fix it. But, the act of accidentally damaging it is not a law violation
And, if it is broken, what difference does it make if it is close to the aircraft door, if the user cannot use it?

This is complete gibberish. You're conflating multiple issues including violation of the ACAA (which the DOT enforces), liability to a consumer under the ACAA, and intent for a state-law tort while also bandying about words like "illegal" without actually knowing what the word means.

I admit my ignorance of these issues. Your further clarifications would be appreciated. However, I think based on the sequence of posts here and ordinary English meanings, mvoight was not simply "bandying about words like 'illegal'." Rather, mvoight was directly responding to OP's statement:
So mvoight made the translation "violation of federal law" -> "illegal" and posed a question on that basis, which is superficially reasonable. While mvoight (and I) may well be confused or incorrect, it seems like a good faith attempt to engage with the terms stated by OP. I too would like to understand whether "the act of accidentally damaging it is not a law violation".

Given that this was an international trip to/from Spain, the Montreal Convention applies and so AA is liable up to XDR1131 for damage to checked baggage

Put a claim in writing, detailing how much expense that the damage caused and claiming that amount

I did not mean to imply you were not familiar with the process and you were so courteous in your reply which I also thank you for. I think this boil s down to a device failure as you indicated and not actual compensation. That said, AA should be made aware of service failure and the behavior of the flight crew.

OP, how much did you have to pay to have someone assist you into your house?

I didnt bring up the word "illegal", the OP did. The OP it was illegal to not deliver the chair in the condition it had been received.

The only monetary damage due seems to be for the expense in hiring someone to meet the taxi at his house to help OP inside.
I cannot imagine that is a super large amount. I don't think he is legally entitled to pay for waiting for transport.
So, he can request AA pay for the attendant, and sue if they don't.
If this happened to me, it would not be worth the effort to proceed further, after making the compensation request again.