Family Boarding doesn't happen before A, it happens after the A group, before the B group. Here's the full boarding order: Preboards BS and Upgraded Boarding: A1-15 A-Listers, EBCI, the lucky, and 24 hour check in (possibly): A16-60 A-Listers who didn't get an A pass, Family Boarding: After A, before B More EBCI (possibly) and 24 hour check in: B1-60 Everyone else: C1-60ish, give or take Someone with a B60 position will be -- depending on the number of preboards and, often more importantly, the number of people using Family Boarding -- anywhere between approximately the 110th to 140th person to board. 737-300s & 700s hold 143 passengers, the 800s hold 175. The number of thru passengers will also directly affect your seat choices.
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