I have a Blue Inc. challenge offer from JetBlue where I can achieve Mosaic if I do 4 RTs (or 8 one-ways) between now and December 31.

I have several trips planned already (I fly Jetblue at least 10-20 times a year, so I'd like the status) but I am not sure if the offer applies to existing bookings - they mention:

"Registration window 9/8/2016 through 9/13/2016. Traveler must register at Blue Inc. before first booking and must complete four (4) roundtrips or eight (8) one-way trips on or after 9/8/2016 and before 12/31/2016. Eligible for new bookings only. Bookings must be made on blueinc.jetblue.com. Offer does not apply to non-revenue travel (e.g. travel booked with a travel certificate, TrueBlue award flights, etc.)"

So unlikely that the two flights I am doing this month qualify.

I'm thinking about how easy or cheap it would be to do this out of SFO. The cheapest / quickest routes are SFO-LGB and SFO-LAS - would it be worth doing two or three 'segment runs' to get Mosaic?