i've got same bug with my dropships. full equipped and fueled dropship with men onboard doesn't shown in the list when i click on a mission. And if i start it manually it can fly to the mission and back without any problem.
several days later one of my 2 dropships begin to appear on the list, and the second one still doesn't
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And by the way. is there any reason to use an interceptor as a dropship? what can a single man do? well ... Rambo maybe ))