first-class

first-class (1)  {adj.}

1. Of the highest class or best kind; excellent; first-rate.

Jane did a first-class job of repairing the coat.

It was a first-class TV program.

Compare: TOP-NOTCH.

2. Of the best or most expensive class of travelling.

Mr. Jones bought a first-class plane ticket to Chicago.

3. Belonging to the class of mail for sending letters, post cards, and handwritten or typewritten mail that is sealed.