Spotted on flights - for UA:
https://www.google.com/flights?lite=...49*2.GBP.19249
Spotted on flights for AM:
https://www.google.com/flights?lite=...49*2.GBP.19249
Should earn 100% PQM on UA since it's a normal economy ticket (i.e. not Basic). I believe this route is also eligible for CPUs? Also as a UA Gold you'll have access to all * lounges including UCs since it's an INTL itinerary. N.B. UA is currently running a milage bonus promotion on flights from EWR to MEX where you'll earn 5x bonus miles:
https://promotions.united.com/offers/MEXoffer
Safe Travels,
James