Join Date: Jan 2008
Location: Tricoastal - London, New York, Silicon Valley
Programs: DL DM/2.5MM, 20 Years Top Tier on DL, UA 1K, AC E75k, MR/SPG Lifetime Platinum
Posts: 1,309
Worst case, just buy a refundable ticket to somewhere else much later than your son's flight. Check in online, go through security with him, hang out until he leaves, then just call DL and tell them your trip was canceled. They'll void/refund the ticket. I have done this several times, even internationally - no issues.
Good luck to you...
Regards,
TFD