Have you looked at Delta airliines website??? Amazing place to find out that sort of information.
If you go into Deltas website you will probably find the answer to your question.
The current instructions are: Carry on: not to exceed 40lbs. and 45 inches total size (H+W+D).
Checked luggage: two bags not to exceed 50lbs. and 62 inches total size (H+W+D).
Hope that helps. .... Neil.
Many thanks Neil & Ida for your quick reply, that helps a great deal.
Regards G Robinson.
Many thanks for all replies, a great help.
Regards to all.