There is no great glaringly obvious flaw in Altitude that ruins it. It's not outright dumb, the plot more-or-less makes sense, the acting is serviceable, but it's just so... Nothing. There's not a single person, place or thing that ingratiated Altitude to me. It's as forgettable as they come, and does nothing you haven't seen done better elsewhere.
Final rating:★½: - Boring/disappointing. Avoid if possible.