Error Fare??? No F seats of the AA flights shown on Google
Looks like this was an error.
Google Flights give a few data in July and August at prices down to $2,780 or so, when you look at trips of 7 or 8 days (no shorter trips). Route PHL-MIA the MIA-MAD on AA68 listed as a 772
When you go the AA.com you at first get the flights and prices on Google (including a price for both J and F) but when you select flight AA68 you get a message that the fare no longer exists and the F class on Flight AA68 has disappeared.
It seem that they are using a refitted 2 class 777-200ER on for AA68 but somehow a glitch occurred and they were pricing F seats that do not exist.