Abstract: In some embodiments, systems, apparatuses and methods are provided to enhance delivery of packages and/or cargo through the use of unmanned delivery aircraft. In some embodiments, a mechanical package release system is provided that comprises: a package release hanger configured to couple with and suspend from an unmanned delivery aircraft; and one or more tension supports each configured to secure with a package and to releasably couple with the package release hanger wherein a decrease of at least a threshold amount of a force being applied by the weight of the package on the one or more tension supports induces a mechanical release of the coupling between the one or more tension supports and the package release hanger resulting in a release of the package from the unmanned delivery aircraft.