Jack’s back!

Jack the Cat — the kitty who survived a harrowing two months in a JFK Airport ceiling with little food or water — showed signs of improvement yesterday that included “more interest in food.”

Plucky little Jack garnered worldwide attention when he was separated from his owner, Karen Pascoe, as she boarded a flight to San Francisco on Aug. 25 — and miraculously dropped from a ceiling tile alive on Tuesday inside an airport customs room.

The cat had been at death’s door, but his blood pressure was better, and he was getting more feisty, friends said.