Vapor Trail

Vapor Trail is a female Pegasus pony who appears in the episode Top Bolt.

Depiction in the series
Vapor Trail is a close friend to Sky Stinger and loves spending time with him supporting his dream to become a member of the Wonderbolts.

It is later discovered that throughout the time she has spent with Sky Stinger, she has also been helping him fly professionally to get him into the academy. She never told Sky this because she didn't want to crush his hopes, but when Twilight and Rainbow Dash convinced her this was the only way to solve their friendship problem, she eventually confessed to him.

Finally, with help from Twilight Sparkle and Rainbow Dash, the two pegasi's talents were seen and they were both accepted into the academy.

Merchandise
My Little Pony: Cutie Map Quest A Punch-Out &amp; Play Activity Book.

Promotional material
Vapor Trail's name is spelled as "Vapour Trail" in an official summary of the episode Top Bolt, similarly to Shining Armor's name being spelled as "Shining Armour" in some materials.

Quotes
"Thanks, Sky, but I don't think I can sneeze my way into the Academy. [sighs] I'm pretty beat, I'm gonna hit the showers."

- Top Bolt

"Flying together gave us both what we wanted! But I never told Sky how much I was helping him. It started with a small boost here, or a little gust of wind there, but I didn't think my help could actually hurt his chances!"

- Top Bolt

"Well, not at first... I just wanted to be with Sky. But learning to do all those fun tricks with you? It made me realize this is something I want for myself!"

- Top Bolt