I'm flying from IAD to SEA non-stop on United in August (4months away).

to seatle, it's a Boeing 752.
Orbitz says the plane has 40 rows.
Row 33 is completely booked already? and there are people sitting in row 34. it's empty between rows 26 and 32.

Seatguru has this: http://www.seatguru.com/airlines/Uni..._757-200_A.php
It's only shows 34 rows?!


Coming back to Dulles, it's an Airbus 320.
Orbitz depicts the plane as having 37 rows and 2 isles like this:
ABC D EF

so people in Row D sit alone?!
and again Row 33 is filled already. and some people are sitting in Rows 34+35. it's empty between Row 23 and 32.

Seatguru shows 26 rows and 1 isle: http://www.seatguru.com/airlines/Uni...irbus_A320.php


Why the differences?
And What's so special about Row 33?