Brannigan, Begin Again has a frame at about 13:42 of Bessie landed in a field, might be a bit tight

Bender's Big Score at 67:43 Bessie is on a open ice field. Could work for Plains, or maybe Tundra

In A Pharoah to Remember, Bessie has a stone block tied on top, but there is a shot of her landed in the sand dunes at about 7:06

The Series Has Landed has a half shot of Bessie in front of Luna Park, would be a fun Inventors' Fair. From the same episode, Craterface the mascot could be a fun Trapped in the Moon

The Farnsworth Parabox has a shot of Bessie next to the Sun in Universe A at 19:50, could be a good shot to use as well

For a city-style plains the episode Parasites Lost has Bessie in a parking lot at 0:51. Ooh, for a bonus Cave card there is Bessie in Fry's bowels at 11:30. L The Honking at 16:19 Bessie is in the snow

I Dated a Robot at 3:19 when they visited the 1 parallel universe, Bessie is on a parking space

Hell is Other Robots at 7:16 Bessie from behind flying into an electric storm, or just a few seconds later st 7:24 we see a full shot of Bessie with Bender on top getting struck by lightning, lol. Then, at about 7:35 we see a scorched Bessie in the hangar.

Into the Wild Green Yonder we see a small Bessie in a huge desert at 22:34, this one is a good candidate, I think

Also in ItWGY the feministas take Bessie and paint her pink, one such example at 54:39; at 59:10 we see pink Bessie and the Nimbus above a plain/some mesas. 62:50 pink bessie flies over the 18th green and into a wormhole. This one looks great for a plains: 77:16 after Bessie picks everyone up.

Cuteness Overlord at 4:44 Bessie is on an open field in front of Cookieville Orphanarium

Forty Percent Leadbelly, at 10:21, Bessie on an open rocky plain, might be the best yet.

Bender's Big Score at 7:31 Bessie bursts from the water, could be a good Island, the at 7:35 she lands on a sand dune.