Justice League of America #157 (August 1978) VG $6.00
In August of 1978, there were three women in the JLA, but instead of showing Hawkgirl along with Wonder Woman & Black Canary on the cover of Justice League of America #157, they substituted the Pinioned Princess with the Maid of Might, Supergirl. As the banner on the cover indicates the entire JLA is involved and judging by the action this is one of those the-guys-against-the-girls story. But before a battle of the sexes happens, we witness Ray Palmer revealing himself as the Atom to his longtime fiancé Jean Loring on the eve of their wedding. Shocked and upset Jean threatens to call off call the whole thing off. The Phantom Stranger shows up and warns the rest of the JLA about a dangerous situation on a deserted island in the Pacific. Then in a conversation with her cousin Kal El, it is revealed that the only reason why Supergirl is not in the JLA is because she does not want to join the JLA. Perhaps the Girl of Steel does not deserves to be on the cover of the Justice League of America.
As for Hawkgirl she does not play a role in the main story and she appears only in the epilogue as a member of the wedding party for the marriage of Ray Palmer and Jean Loring.
From the solicitation:
Joe Staton does the cover for “Till Doom Do Us Part!” in which Ray Palmer, the Atom, marries his longtime sweatheart lawyer Jean Hyatt, in a story written by Gerry Conway with art by Dick Dillin and inks by Frank McLaughlin. Just about every JLA member appears in this wedding issue, including Superman, Batman, Green Arrow, the Flash, Wonder Woman, Supergirl, the Black Canary, Aquaman, Hawkman and Hawkgirl, the Red Tornadio, Green Lantern, and, of course, the Atom. Cover price $0.60. Grade: Very Good