The TA is US based. In fact just down the road a piece.

"When a TA makes a reservation, everything is general confirmed (fare, seats etc). There is a specific deadline for ticketing that is a combination of overall TA rules and specific fare rules. You can, with certain premium fares, reserve a long time before and ticket just days before the flight (and hence) payment."

Is this a TA only thing then? Where do I find these rules?