I think ATC and pilots do an amazing job considering how many English accents are used and how many different ways the same thing is said, but it's time to streamline and organize the communication system.
I learned military radio proceedure in late 60s. Universal terminalogy in short concise statements.
Current radio communicaton is nothing even remotely uniform, short or concise. It's more like a phone conversation using abbreviations for commonly used words/phrases... and may words used for same meaning. It's no wonder ATC and pilots get confused. Problem is not language accent, it's the lack of the universal use of a communications code.
As good as ATC and Delta 1063 did, it is still not the use of a universal communications language/code.
Delta 1063 bird strike dialog:
"Aah Delta 10 6 ter 3 has had an engine failure on the right engine declaring an emergency do to a bird strike."
Should be something to the effect:
"Delta one zero six three, engine failure number four, mayday, bird strike"
Maybe not mayday, but something simple to denote a lessor degree of emergency.
"Delta one zero six three, bird strike number four, Delta one zero six three"
Just my thoughts after following this thread from the start.