Yes you are allowed to carry on your own food to a Delta international flight.
Delta shows edited in-flight movies. However, they get an outside company to do this for them. Delta do not themselves edit the movies.
you have to be 20 to be a flight attendant for delta airlines
Yes no problem as long as it is an internal flight and not international. It is best carried on rather than checked.
You cannot download Delta Airlines skins for all the aircraft. You have to download Delta Airlines skins for each aircraft individually. To find the skin for the aircraft you want, type "Flight Simulator X Delta Airlines", and the aircraft you want the skin for. Example: "Flight Simulator X Delta Airlines 737" or "Flight Simulator X Delta Airlines 747"
If one needs to check flight schedules for Delta Airlines the best place would be directly on the Delta website. Their website is very user friendly and from the home page you would click on flight schedules and enter the information such as flight date and flight number. The site will then provide the desired results.
Delta lands at Heathrow T4.
yes
probably delta
yes
No
Yes they can and are in fact often served on Delta flights too.