I think Central America could be our penultimate leg.
Regarding about the penultimate leg that we've talking about, and this time could be Colombia that Bogota is definitely likely for a large city penultimate destination. Colombia is an underused country.
Anyway as Plaidmoon talking about the flights, here is the possible schedule:
American 1130 to Miami, departs at 0655 (6:55 am) and arrives at 1155 (11:55 am)
American 4483 to Detroit, departs at 1339 (1:39 pm) and arrives at 1646 (4:46 pm)
Delta 980 to Atlanta, departs at 0710 (7:10 am) and arrives at 1309 (1:09 pm)
Delta 902 to Detroit, departs at 1455 (2:55 pm) and arrives at 1657 (4:57 pm)
The scheduled arrivals are fit for timings in the finale before projected 5 pm arrival.
ALL SPEC THAT IS JMO