I don't think you have much choice by the sounds of it.
What scandalous behaviour by the airport.
Were Comed operating your a/c when it was grounded?
I can't see how anyone could start seizing an a/c just because it was operated by someone else on a previous occasion who didn't pay a bill. Doesn't sound right.
Unbelievable the airport acting in this way.
I wish you Good luck.
There are a number of lawyers on Prune. Hope one of them spots this and gives a view.
Look out for "Flying Lawyer" in particular.