The miles accrued are determined by the operating airline. Please note that the booking class shown on your ticket may differ from the booking class relevant for mileage accrual.
Ensure your Mileage Plus number is in your reservation at check-in. But if you do not receive your miles go to Retro Credit.
To expedite the missing mile credit process you will need to provide both your Hawaiian Airlines and United Airlines boarding passes and ticket numbers.
For award reservations, call United Reservations and request the International Desk.