Whether named plaintiffs in a class action retain standing to appeal a district court's denial of class certification when the named plaintiffs' claims become moot

 circuit courts, but contrary to the D.C. Circuit below, this Court’s decision in U .S. Parole Commission v. Geraghty , 445 U.S. 388 (1980), remains good law in the litigation under Article III to appeal a 2. Whether named plaintiffs in a class action retain standing to appeal a district court’s denial of class certification on behalf of absent class members when, after that denial, upon defendant’s motion, the named plaintiffs.