Originally Posted by exwannabe

Keep this simple and clear with your 3 issues

Due to a canceeled flight (for whatever reason):

. Because of the airport change you drove GRP-APL and incurred whatever expenses (both ways).
. You suffered a 6 hour delay
. Bags delayed causing an issue a problem at a business dinner.

I do not know what is reasonable for this. I would guess you might get a bit more (particularly if you include the APL parking).

But keep it clear and direct else the legiit issues get lost in the fog of war.

EDIT: Do NOT try to claim the "lost vacation time". Regardless of what you think about this one, no airline will accept such claims on them and that might cloud your legit issues.

EDIT2: No reason to go to airhelp, whatever taht is. just reply to DL. that you think they should do more for you.