This is incorrect information. If you want a correct answer on scheduling issues you need to go to the DALPA committee section and post your question. You will get a QA's answer. I see so many wrong things posted contractually on here that I don't even bother to try and correct most of them.
Short answer to the above question is there is only pay protection in the month the trip originates. Anything that spills over into the following month has no protection until after the carry out trips are adjusted in the following months bid package. You could bid a 4 day trip worth 24 hours and end up getting only paid for the first day if the trip is modified and flying dropped in the following month. Even if it flies as a 4 day the value can be reduced and you get no protection on the spill over portion.