I helped my in-laws with online NW Airlines check in. Turns out the resulting boarding passes don’t page break correctly when printed from a mac. I had to increase my viewing font-size in safari in order to avoid passes running off page one and continuing on page two.
How easy could it have been to do a print format that works? They must not have even tested on macs nor did they alert me my browser was invalid.
Something else – the url of their thank you page is “CheckInFailed”