Delta chose to go with Bombardier planes in this case[1] which directly affected Boeing's ability to sell them their equivalents. That sounds like competition.
> which directly affected Boeing's ability to sell them their equivalents.
Boeing's bid to Delta was some Embraer E series they had from an Air Canada trade-in. [1]
No model of 737MAX competes with the C Series for Delta's RFP. Both Boeing and Delta have readily admitted this when asked (see [1]).
Boeing has nothing in the market to compete with regional jets like the C Series. This is exactly why they are now looking into buying Embraer to counter Airbus acquiring a majority stake in the C Series. [2]
> That sounds like there is competition for this market between Bombardier and Boeing.
Not sure how you came to that conclusion. Let me try again:
It's like going to a Ford dealership and asking them for a scooter. Because Ford doesn't manufacture scooters, they offer to sell you a Vespa instead because the last customer traded one in.
Sure, they'll make a sale, but it's not like Ford makes the Vespa or the replacement parts for a Vespa (maintenance contracts are a BFD in aerospace, often worth more than the initial plane order).
So now you (Delta) come and want to buy 100 Vespas, and Ford still doesn't make a Vespa and has no plans to. So while slagging Vespa (Bombardier) for detracting from Ford's scooter sales they start talks to buy Vespa's closest competitor (Embraer).
Your own link explains how uncompetitive they are. Boeing's 737s range from 138-200+ passengers, the CS100 is in the 108-133 passenger range. More importantly the CS100 is significantly smaller and lighter, helping make it cheaper to operate on the routes Delta wanted.
So to bid against Bombardier, Boeing didn't even try to offer 737s, knowing they can't fit Delta's needs. Instead they offered 717s and Embrauers, both of which are used (Boeing canceled the 717 over a decade ago).
[1]https://en.wikipedia.org/wiki/CSeries_dumping_petition_by_Bo...