Could another celestial body make a bi-elliptic transfer significantly more efficient?

Could using the gravity of another celestial body allow for something like a bi-elliptic transfer
that uses less delta-v than the theoretical "infinite apogee" delta-v requirement?

If yes, has such a transfer ever actually been performed?

• Do you mean a secondary celestial body in addition to the primary? Mar 7 '14 at 1:17
• Yes. ${}{}{}\;$
– user2822
Mar 7 '14 at 1:24

• It would be like that. $\;$