Well, the Mets offer two such 40-game half-season plans.
One has every Friday, Saturday, and Sunday game. The other has every Weekday game. The odd-game is Opening Day, which you are guaranteed, but not necessarily in your seats. This might be the first time the Yanks visit for three games since they got rid of the 4-20 game plans and reduced the number to 3. Don't know how that impacted 40-game plan holders, though... I thought the 40-game plans, were, at one time, every other game... The last time the Yanks played three, I had Friday and Sunday included in my 20-game Weekend A Plan, or whatever it was called back then... Now it's a Saturday Plan...
If you were a person with the 40-game weekend plan, would you want to give up your seats for the guy with the 40-game weekday plan?
Days-of-the-week plans used to be that... Days of the week. Schedule / opponents be damned. Not so much anymore.