JetBlue TrueBlue - Airport Assignment Seats?

Does JetBlue have any seats blocked off for airport assignment?

My family and I will be traveling tomorrow (slightly more than 24 hours until check in) and I was wondering if JetBlue had any seats blocked off for airport assignment, or whether they will be able to accommodate us without an extra $200 charge.

My family and I already booked the flights, and when we booked, there weren't very many seats left. We're all over the plane, split up, with the only other option being the EML seats.

Would they be able to reseat us so that we can sit together? (on the return flight, we all have middle seats, YIKES!) Or would we have to bite the bullet and book the EML seats?

Airport would control some seats. Go early and ask for free

E190

Rows 1&2 Seats A-D
Rows 12-14 Seats A-D
Row 25 Seats A-D

Row 1 and rows 12-14 are EMS blocked. If the flight is full and all that is available is EMS seats when you check in you will get a boarding pass (without a seat assignment) and the gate agents will assign an EMS seat free of charge. Row 2 is blocked for any special needs customers but can be assigned to anybody if requested. Row 25 is blocked for any special needs customers as well, especially UMNRs

A320

Rows 1-5 Seats A-F
Row 6 Seats A-F
Rows 10&11 Seats A-F
Row 25 Seats A-F

Rows 1-5 and Rows 10&11 are EMS blocked. If the flight is full and all that is available is EMS seats when you check in you will get a boarding pass (without a seat assignment) and the gate agents will assign an EMS seat free of charge. Row 6 is blocked for any special needs customers but can be assigned to anybody if requested. Row 25 is blocked for any special needs customers as well, especially UMNRs

We were already assigned seats by Travelocity. I can't un-assign the seats, only move them.

Also, the Travelocity agent booked the roundtrip as a one-way trip with a 3-day layover (BOS-LAS-BOS). Will that affect anything if we ask to be reseated?