red-letter day

June 3, 1950 was then another red-letter day in United's history.

It could mean the difference between a red-letter day and an empty basket.

Running across an exceptionally good one makes it a red-letter day.

Tonight was going to be a special night, one to put in the diary, a red-letter day.

When the books came out, they were not red-letter days for me.

For my own family, this red-letter day was marked by a minor drama.

Someone asked where terms like "red-letter day" came from.

"This is a red-letter day in my life," Rockefeller began.

Still, this has been a red-letter day for crime prevention, I want you to know that.

He recalled that today was a red-letter day of sorts.