OK not very plausible but I think within the realm of possibility. Jordan was the Arab country liked most by the British and Americans. So what if after the 6-day war, they put pressure by backchannels on Israel to give up their conquests and this pressure somehow actually works? I don't think this is very likely since Israel would probably see losing Western support as not as bad as giving up some territory, but I mean it's possible. So say in July 1970, they pull back from most of their West Bank territory except Jerusalem and a 5000 meter area around the city. Publicly, the Americans are not involved whatsoever, it is London and King Hussein just demanding the rightful return of Jordanian territory after Israel launched a sneak attack (or whatever Hussein thinks is good for PR). On some secret channel Hussein promises to not let any military aircraft fly over the area Israel is withdrawing from as a gesture to say "hey I won't use this place as a launching point to take back Jerusalem." Does this make Yasser Arafat more moderate and clamp down on extortion in Jordan that caused the monarchy so many headaches OTL?