Hi all, I've sent (by regular mail) my mother's N-400 on February 23rd. It was received on February 26th by NSC and the check was cashed shortly after. We've received the NOA (I-797) about 10 days ago. My mother is older then 75 years of age and therefore no FP is required of her and she has been a PR since 1991. The online case status is still not available and the interesting thing is if I change the last digit of her receipt number -say instead of 1, put 2 or 3 (LIN*00XXXXXXX)- I see that online case status is available to those other applicants with the same receipt date of February 26th. Lets see if the other posted timelines hold for this case!!