Wrong.
Even if they did go out of business, the UPS-IBT Pension Plan is funded at 100.00% as of 12/31/2017.
That means there is enough money in the fund to pay the current liabilities. So, even if they went out of business, there would still be pension payments for a long time to come.
The same for those not in the UPS-IBT Plan. Although some of those may not be as well funded.
Actually, I believe the PBGC takes over the pension, since they guarantee it, and the money UPS had in the pension fund goes to them.
But I wouldn't worry, too much, about them going out of business, at least not anytime soon.