The 4K disc is region free, but a region A or multi region player is required for the blu ray disc.
Cowboys & Aliens (LE 4KUHD + Blu-ray w/ Slip)
Cowboys and Aliens Blu-ray (2011) Olivia Wilde, Favreau (DIR) cert 12 2 discs
Cowboys and Aliens DVD (2011) Olivia Wilde, Favreau (DIR) cert 12 Amazing Value
Aliens (4K UHD Blu-ray) Al Matthews Daniel Dieker William Hope Paul Reiser
Alien, Aliens, Alien Covenant 4K + Blu Ray 2 & 3 Disc Box Sets EU Releases
Aliens (4K Ultra HD)
