Dark, balloon like object filmed over Mexico

YouTube user dolar4797 captured this footage somewhere over Mexico in January 2011 (or in March 2008 — the original video is named 20080301222454.mpg).
Video 1
Video 2
Video 3
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On the 3rd video of the Mexico balloon shaped UFO, where it descends beyond the trees, the producers of the video made a mistake. The object appears to descent in front of the highest branch in the tree before it goes behind the rest of the tree.