About 15 years ago, my father visited me in Jackson MS (JAN) from Toronto (YYZ). He got a cheap ticket to New Orleans (MSY) on US Air so I picked him up there, about 3 hours drive from jackson.
On his return, something came up and I could not drive him back to MSY, so he bought a one-way ticket on Royale Airlines (now defunct) to MSY, with plenty of time to catch his flight to YYZ. The JAN-MSY one-way ticket, if I remember well, was about $75. The airline booked his baggage straight through to YYZ, even though he had a separate ticket.
Then the trouble started. The plane had a mechanical problem and could not depart. So Royale rerouted him on DL to MEM, then Piedmont (also now defunct) to MEM-BNA, where he intercepted his original US Air flight at its scheduled stop there.
Pretty wild, isn't it? He ended up back in Toronto right on schedule, where my sister picked him up and she never would have known the difference!
"In God we trust, everyone else bring data"