Bull Feathers. The airlines don't like it because they would need to make IT infrastructure changes to add this info to the PNR's. It is telling that they aren't complaining about the requirement for full first name instead of initial, because that would require very little in the way of changes (just a validation check).

Here is what I find interesting:

1) It seems like this change will remove the power of the airline to deselect pax, as the selection is now done by the TSA and not the carrier.

2) The implementation of the DOB/Sex is highly likely to be so flawed as to actually provide less security than the current situation. Unless the DOB/Sex is printed on the BP or the ID checker has a terminal to pull up this info, there will be no positive matching of DOB to ID, and therefore a terrorist who would today be stopped can simply provide an incorrect DOB to the airline, and then board using his real ID. Essentially, it will be the equivalent of "No, he's not the Osama bin Laden whom we are looking for - no need for SSSS."