AN F100 FLT ATTENDANT IN CHARGE RPTED AN APPARENT BIRD STRIKE DURING TKOF FROM LGA; WHICH DAMAGED AN ENG; CAUSING THE CAPT TO DIVERT TO JFK.

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APPROX 1 MIN AFTER TKOF; THERE WAS A LOUD 'BOOM.' THEN THE ENTIRE ACFT STARTED TO VIBRATE EXCESSIVELY. MY JUMPSEAT WAS IN THE VERY BACK OF THE PLANE; RIGHT BTWN THE 2 ENGS. IT FELT LIKE THE WHOLE AFT PORTION OF THE PLANE WAS ABOUT TO VIBRATE/BREAK OFF. I IMMEDIATELY GOT OUT OF MY JUMPSEAT AND RAN TO THE FRONT OF THE PLANE. WE COULD HEAR ALL OF THE WARNING DEVICES GOING OFF IN THE COCKPIT; SO WE DID NOT IMMEDIATELY 'BOTHER' THEM. WITHIN A FEW MORE MINS; I CALLED THE COCKPIT. THE CAPT; INDICATED THAT WE HAD LOST AN ENG AND WOULD BE LNDG IN JFK IN JUST A FEW MINS. I ASKED IF WE SHOULD PREPARE FOR A PLANNED EMER LNDG; AND SHE SAID; 'NO.' I WENT TO THE WINDOW EXITS AND REBRIEFED - IN MORE DETAIL - THE OP OF THE WINDOW EXITS. I RESEATED ONE ABLE BODIED MAN IN THE AFT L-HAND SIDE EXIT WHERE NO PAX WERE SEATED. THEN I SAT IN THE FRONT R-HAND SIDE PAX SEAT WINDOW EXIT FOR LNDG. WE LANDED WITHOUT INCIDENT. ALL PAX SAFELY DEPLANED. THE AFT R-HAND WINDOW DIRECTLY ACROSS FROM THE ENG HAD BIRD RESIDUE SMEARED ON THE WINDOW. OXYGEN MASKS FELL IN THE LAST ROW ON THE R-HAND SIDE OF PAX SEATS. NO PAX WERE SEATED THERE; THEREFORE; OXYGEN WAS NOT DEPLOYED.