It's doubtful, but who knows.
The -700 can pretty much handle WN
's loads at this point. In fact, the rumor is that they're looking for something smaller rather than larger. I don't buy the rumors that say WN
is looking at the Embraer 170 and 190, but they're out there.
The -800 and -900, from what I understand, were pretty much designed to be used by "major" carriers. They're big enough to offer a large coach section while maintaining first-class amenities. I don't know the numbers off-hand, but I would bet that an -800 or -900 with no first class could hold close to 200 pax. I don't think WN
has any routes that would justify these numbers; WN
would rather increase frequencies than buy a bigger plane for most.
Again, I haven't had time to check out Boeing's web site for this, but I also believe that the range of the -700 is longer than the -800 or -900. If this is true, WN
would probably rather just stick with the -700.