Join Date: Aug 2007
Location: Truth or Consequences, NM
Programs: HH Diamond, Marriott Titanium, Hertz President's Circle, UA Silver, Mobile Passport Unobtanium
Posts: 6,196
You didn't state which airline but I suspect this is an airline rule and not a Chase rule. From experience, for example, I can tell you that THAI airways will not allow you to book a flight online if the flight is within six hours of when you are trying to book. I suspect other airlines have similar - if not more stringent - restrictions.