At what cost?
FTC has no legitimate objection to a non-transport company buying into the market.
It is NOT consolidation.
Union contracts can be renegotiated with new owners.
Horizontal expansion is one the FTC gets involved in more and more. In the end they usually approve but the months of whining and hearings can be expensive.
Union contracts can be renegotiated but you’re better off not having them at all. Pissing contests with unions are only avoidable by not having unions.