BEGINNING & END
'(<a href="http://www.j-archive.com/media/2007-05-30_J_20.jpg" target="_blank">Cheryl of the Clue Crew indicates the monitor.</a>) A porkchop plot, named for its shape, is used for planning space missions; the vertical & horizontal <a href="http://www.j-archive.com/media/2007-05-30_J_20a.jpg" target="_blank">axes</a> plot possible dates for these 2 flight events'
takeoff & landing (or launch & arrival)