Off Topic Only Connect - Solve the wall

Another wall..Last one. PROMISE !!!!!!!

Lexington, Lincoln, Buckle, R.Reagan
Gainsborough, Lonsdale, G.Ford, Galileo Galilei
Da Vinci, Marco Polo, Seat, Karate
Stamford, Langley, Spalding, Sandro Pertini

 

Well known bridges: Lexington,Stamford,R.Regan, Sandro Pertini.
Related to belts: Buckle, Lonsdale,Karate, Langley
Makes/models of cars: G,Ford,Lincoln,Seat, Marco Polo.
Artists(polymaths): Da Vinci, Galileo, Spalding,Gainsboro

Three Lincolnshire towns/cities in there, couldn't work out a 4th !

 

Galileo, Da Vinci, Marco Polo, Sandro Pertini - Italian Airports (Pisa, Rome, Venice, Turin)
Lincoln, Spalding, Gainsboro, Stamford - places in Lincolnshire
Buckle, Seat, Karate, Lonsdale - Belt
Lexington, Langley, Ford, Reagan - US Aircraft Carriers

 

Can't say anything other than superb OT...

 

Who are the two US presidents to pass away before their fathers?

 

Thanks. Guesswork was involved. I didn't know Pertini, but it fit with the other airports. I knew Lexington and Reagan were Aircraft Carriers and couldn't think of another connection.

 

I was ok with the belts and Lincolnshire but nowhere near the others!