BEVERLY HILLS, CA— Hilton HHonors, the hotel chain’s guest reward programs, has added Gulf Air, the national carrier of Abu Dhabi, Bahrain, Oman and Qatar, to its list of travel partners. Beginning this month, HHonors members will earn 500 miles through Gulf Airs FALCON frequent flyer program, for every qualifying stay at more than 2,100 participating hotels worldwide. The addition of Gulf Air brings the total number of HHonors airline partners to 57, the most of any hotel guest reward program.