Join Date: May 2002
Location: Pittsburgh
Programs: MR LT Titanium, AA LT PLT, UA SLV, Avis PreferredPlus, HH Gold, Hertz PC, National Executive, etc.
Posts: 31,682
I seem to recall that TSA/Homeland security forced airlines to reduce check-in times to 24 hours - they had previously been longer.
I suspect it has to do with the time needed to do checks on passenger lists and return data to the airlines - data is sent 72 hours in advance, iirc.