There's liitle doubt that the first-century Christians thought the second coming would take place during their lifetime, their "generation".
If one applies Jesus' words only to the first-century, the generation is basically wrapped up quite neatly, spanning from 33 to 70 AD, a nice, neat 37 years.
But there's that nagging little problem - no return by Jesus in 70 AD or any time shortly thereafter. No rapture, no meeting Christ "in the air".
If we apply the "generation" to a later time than that, we're back to all the problems that the WTS has faced all these years - trying to figure out when it applies.
But as I stated earlier, I think the linked article from that Boreans site is the best guess in view of the fact that no other post- 70 AD applications have succeeded.