I went over 18,000 miles back in May, but I am still basic. (I knew that from reading Flyertalk though)
My girlfriend went over 35,000 miles on Nov 17. She was Prestige last year, so she should become an Elite as soon as those miles post. Unfortunately, those miles still have not posted yet, and Aeroplan said it takes 4 weeks once we send the boarding passes in, so she won't become an Elite until March 1.
Those flights with missing miles were on UA. Agents on all legs confirmed that our Aeroplan numbers were in the system, and gave us E+ seats. The trip was a mileage run so that she could get Elite, but we are really disappointed that she won't be able to enjoy Elite benefits for 3 months. Oh well.....