Verified answer

Delta does not fly to Gatwick anymore. Delta now flies into Heathrow

Try Delta's web site and you will find out if they go to Gatwick from where you want to fly from. There is no point in connecting flights, other than within the USA to connect to a non-stop flight to London, as there's a whole ocean between us. Why do you want to land at Gatwick particularly? It's not even in London - it's halfway to the south coast of England, though that doesn't much matter as train connections are just as quick as going to Heathrow.

It appears they do, but you need to be more specific, giving date of travel and departure airport in USA. I don't understand what you mean by ;is there a connection?' Connection from where?