Originally Posted by georgetg

That's not what it says at all...
Again the relationship is specifically descibed in 1.B.46.f

I had a nice conversation with Tim O. Yesterday and we discussed that very point.

1.B.46.f ...the number of permitted 76-seat aircraft may increase on a one 76-seat aircraft for each one and one quarter new small narrowbody aircraft (1:1.25) ratio (rounded to the closest integer) up to a total of 223 76-seat aircraft.

The delivery schedule for 717s starts in late 2013 and varies depending on who you talk to, from 4/36/36/12 to 16/36/36, at any rate it's 3/month...

With 16 717s in service on January 1, 2014 the ratios in 1.B.46.f are triggered for the first time.
16 717 = 12 76-seaters
12 76-seaters = removal of 32 50-seaters

On January 1, 2015 we measure the second time
16+36=52 717 in the fleet =add 42 76-seaters (195 total)
195 76-seaters = removal of 27+27+28+29+3+3=117-32=must remove 85 50-seaters (117 total removed so far)

On January 1 2016 we measure again
16+36+36=88
88 717 = 70 76-seaters
70 76-seaters = 125 hard cap on 50-seaters

It's only the last 76-seater that establishes the hard cap of 125, in 2016 or 2017 depending on the 717 delivery schedule...

Since you mention the MD90s sitting, waiting to get the mods, you can probably interpret this language in context:

1.B.28 “Fleet” means aircraft in service, undergoing maintenance, and operational spares.

Cheers
George