Invisible Plane: Wonder Woman possesses an airplane capable of rendering itself completely invisible to the human eye. Like her bracelets, Diana's invisible plane is forged with Eighth Metal, making it almost indestructible. The Invisible Plane was originally the aircraft Steve Trevor crashed onto Themyscira; it was repaired by the Amazons and upgraded with their technology.
Following the popularity of the Wonder Woman TV series (initially set during World War II), the comic book was also transposed to this era. The change was made possible by the multiverse concept, which maintained that the 1970s Wonder Woman and the original 1940s version existed in two separate yet parallel worlds. A few months after the TV series changed its setting to the 1970s, the comic book returned to the contemporary timeline. Soon after, when the series was written by Jack C. Harris, Steve (Howard) Trevor was killed off yet again.
One of the things I love about event comics is that sometimes even a middling to bad event can lead to a great spin-off or post event tie in. Day of Judgement gave us J.M. DeMatteis's run on The Spectre. Infinite Crisis gave us Jeff LeMire's great run on Superboy. While not a new series, Dark Nights Metal allowed James Robinson to have the near perfect ending to Jason's story in Wonder Woman.
Due to the format of most golden age comics, the majority of story arcs at the time for all characters were the same, Wonder Woman included. More accurately that is to say that there were not story arcs at all, as issues contained two to three stories, all of which started and concluded within the issue in question. There was therefore not much continuity in Wonder Woman until she reached the silver age. The few exceptions to this were in issues which contained a common theme, such as Wonder Woman meeting some leprechauns and each of the three stories dealing with that. Alternately there were some common themes for the character at the time, one of which was dealing with enemy saboteurs. These were mostly contemporary, and thus started as either the National Socialists in Germany or the Imperial Japanese. Later these became others.
Steve Trevor's secretary who befriends Diana. Describing her character, Davis said, "She's a woman in a man's world and so being heard and seen aren't the easiest things, but it kind of doesn't deter her", adding, "Etta is unapologetically herself and I think that that's the thing that has drawn me to her the most". When asked if she was previously familiar with the character, Davis responded, "No. I wasn't. It took me a while to know that I was auditioning for Etta because even when I found out it was Wonder Woman, I still had no idea what the role was. It took a little while then I Googled the character". On Etta Candy's relationship with Steve Trevor, Davis said, "One of the great things that Etta gets to work with Steve Trevor is because Steve is not your typical man, in that he does entrust her with things that in 1918 probably wouldn't have been entrusted to a secretary of somebody who is quite important", further explaining, "So I think that [Trevor] needs her just as much as she needs that because now she's been given responsibility that she wouldn't have normally be given before, and equally he has somebody who could probably fly under the radar a bit. So he can trust the person who no one's really looking at".
^ Greenberger p. 175: "Journalist and feminist Gloria Steinem...was tapped in 1970 to write the introduction to Wonder Woman, a hardcover collection of older stories. Steinem later went on to edit Ms. Magazine, with the first issue published in 1972, featuring the Amazon Princess on its cover. In both publications, the heroine's powerless condition during the 1970s was pilloried. A feminist backlash began to grow, demanding that Wonder Woman regain the powers and costume that put her on a par with the Man of Steel."