missed connection possible with 2 tickets - seperate airlines , need insurance

Hi

Booked delta charleston - new york (lga) 8.00am flight , next flight aer lingus - new york to manchester (jfk) 7.00pm .

Return same route with layover of approx 5 hours in new york

Looking for insurance that would cover missed connection , and does anyone know if it covers the whole aer lingus ticket cost if missed 7.00pm flight from new york

Any help or suggestions would be apprciated .