Source: www.aeroinside.com

A Spirit Airlines Airbus A321-200, registration N675NK performing flight NK-756 from San Jose (Costa Rica) to Fort Lauderdale,FL (USA) with 177 people on board, was enroute at FL340 about 80nm southsouthwest of George Town (Cayman Islands) when the crew decided to divert to George Town due to loud noise, that the crew could not completely locate either from the outside of the aircraft or the overhead panel, fumes developed in the cockpit. The aircraft landed safely in George Town about 18 minutes after leaving FL340.

The occurrence aircraft remained on the ground for about 15.5 hours, then positioned to Fort Lauderdale.

According to information received from Grand Cayman something in the overhead panel was shaking, there were fumes in the cockpit.