People on FT talk about how against the rules this is, but as far as I can see there is no limitation on nested ticketing, just back to back ticketing? Here's a scenario that I'll be doing next month:
JFK-SFO on Tuesday on Ticket A
SFO-SEA on Friday on Ticket B
SEA-SFO on Sunday on Ticket C
2h 'layover'
SFO-JFK on Sunday on Ticket A
I did this because I am going to SF for work from Tuesday to Friday, and I wanted to vacation up to Seattle for the weekend (to see UW-UCLA!). I don't think this breaks the rules?