Looks like UA is matching these, availability is limited.
Fare Rule : PLX6ZDM0
Code:
PERMITTED 15DEC 17 THROUGH 31DEC 17 OR 01JAN 18 THROUGH
10JAN 18 OR 15FEB 18 THROUGH 25FEB 18 OR 22JUN 18 THROUGH
22AUG 18 ON THE OUTBOUND TRANSPACIFIC SECTOR.
PERMITTED MON/TUE/WED/THU ON EACH TRANSPACIFIC SECTOR.
RESERVATIONS FOR ALL SECTORS ARE REQUIRED AT LEAST 30 DAYS
BEFORE DEPARTURE.