Just saw UA posted another milage bonuses:
- Earn 5x Bonus Miles on Flights from Newark to Mexico City (Registration required, offer expires May 31, 2019)
I'm guessing UA won't be generous in awarding 5x PQM for this offer (i.e. it's only award miles?). Last I checked flights to/from EWR to MEX are cheap (~180 GBP roundtrip)
-James