A United Boeing 777-200, registration N210UA performing flight UA-201 (dep Jul 10th) from Honolulu,HI (USA) to Guam,GU (USA) with 335 passengers and 13 crew, was enroute at FL350 over the Pacific Ocean about 300nm southsouthwest of Midway Islands,UM (USA) and about 850nm west of Honolulu when the crew decided to return to Honolulu due to smell of smoke on board. The aircraft descended to FL300 for the way back.
[A] passenger reported that there had been a burning smell prior to departure.
Read the Aviation Herald report.
Read Plane Diverted to Island Due to Burning Smell – Mashable.