This is simply false. Boeing has spent a lot, but less than General Electric, or the National Association of Realtors, or many (many!) healthcare and pharmaceutical companies.
Source: https://www.opensecrets.org/lobby/top.php?indexType=s
Fair enough, I guess. I think of groups like Blue Cross/Blue Shield or the NAR as representing corporations, but I can see how you'd disagree on a strict reading. I didn't mean to mislead.
> General Electric has fallen off a cliff since 1998.
In 1998, GE spent $7.28m on lobbying. Nearly every year since then, they have spent more than that, generally staying north of $16m per year, with the exception of the last three years.
Your statement is true only for the last three years.
Same source: https://www.opensecrets.org/lobby/clientsum.php?id=D00000012... for GE, https://www.opensecrets.org/lobby/clientsum.php?id=D00000010... for Boeing.