The numbers may sound big to us peons but I'm sure once calculated they'd be a fraction of the countries annually gdp. For the US it would probably only take pausing some military contracts. $40 million per jet adds up quickly and there would be knock on savings from maintenance that would not be required.
It's literally a lack of will and uses the same excuses that keep the 99% poor.
Think of the jobs that would be created trying to calculate each individual's owed amount.