I'll just add a recent datapoint that the pre-paid/fixed-fare taxi from AICM to "Zona A" (Colonia Condesa, in my case) appears to have risen to MXN640 now (at least at the T1 Sitio 300 booth), which I found to be very expensive value on a relative basis (compared to most other things in CDMX).

UberBlack for comparison was approximately half that fare; I used Uber to return to the airport with no issues at drop-off (again, paying ~MXN330 for UberBlack) but have also anecdotally heard other visitors getting picked up by Uber unhassled at Gates 7/8 at the far end of T1.