I retired from Honeywell about 5 years ago. In addition to my 401k I had a legacy pension. It didn’t take long for me to decide to take a lump sum distribution, which I was able to roll into my 401k. I truly believe that if the company could find a legal way to walk away from their pension obligations, they would do it. Federal guarantees only pay a fraction if it defaults.
I don’t think every pension is eligible for this, so you’ll need to check with HR as there are many many different legacy pension programs.