My submission for the Concept World bi-weekly challenge. Hope you all like it! It's -literally- a huge floating fortress powered by antigrav. Capable of housing up to 60 aircraft and launching long range attacks.
This took about 2 - 2.5 hours to finish. Made in Photoshop with personal brushes.
I can't possibly think of a situation in which one would NOT use this. Kitten rescue? We have shuttles. Alien invasion? We have guns for that. Ice cream parlor renovation? We don't need ice cream, WE HAVE A FLOATING FORTRESS!