I think that LaKisha & Jen are simply
way behind the other two teams, if they made the Final 3 (which I think they did). Cara & Jamie and Margie & Luke got an earlier flight while LaKisha & Jen got a later flight, possibly delayed as well.
Belle Book
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All 3 teams are required to take only one flight to prevent one team from taking a say, very early flight and being way in the lead...
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Not sure about those rules being recently implemented, but in the past, aside from Seasons 2 & 3, the teams were on 2 (or 3 in the case of Season 6 or 0 in the case of Season
separate flights to the final destination city.