"The Obama administration transferred six detainees from the military prison at Guantanamo Bay to Oman Friday night. The detainees arrived on a U.S. Air Force C-17 plane that dropped them off, then departed and cleared Oman’s air space around
midnight EDT."
http://www.defenseone.com/news/2015/06/obama-administration-transfers-gitmo-prisoners-oman/115222/