Aybar was outrighted to Triple-A Charlotte on Thursday, James Fegan of The Athletic reports.
Aybar was promoted to the Triple-A level in late May, and he's posted a 7.45 ERA and 1.88 WHIP in 19.1 innings over 20 appearances with Charlotte. He'll lose his spot on the 40-man roster to help make room for Elvis Andrus, who agreed to a contract with the White Sox on Thursday after being cut loose by the A's.