The booster has not yet flown, no. The closest it came was a all-engines static fire (during which 2 out of 33 engines didn't fire, but it was still enough of a

The booster has not yet flown, no. The closest it came was a all-engines static fire (during which 2 out of 33 engines didn't fire, but it was still enough of a success to continue with the program apparently).