My girlfriend has told me that several times at LHR that she went to check in for a BA flight (both shorthaul and longhaul) and was told that she can't check in until 3 hours prior to the flight. She was traveling in WT. I was confused by this as I've showed up at LHR T4 in the past as much as 4-5 hours before a flight and was able to check in then. I was traveling in CW and came early since I had lounge access. Does the class of travel affect this time? Thanks