Originally Posted by
Dave Noble
...
Not arriving in accordance with published times could impact eligibility to denied boarding compensation on an oversold flight, but the email statement isn't indicating the latest time to check in
I believe it is given this footnote indicated by the the *:
*NOTE: You must check in for your flight by the specified time prior to your scheduled departure. Failure to do so may cause you to miss your flight and forfeit the fare paid.
MUST is pretty conclusive.
To the OP, I would be looking to arrive at the airport at least two hours before your flight - takes the stress away and you can relax in the new *A TBIT lounge while waiting for your flight.