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Sonic Rainboom (February 18th 2011, 22 minutes)

Summary: Rainbow Dash is to compete in the Best Young Flyers Competition, but gets an unexpected challenge from a friend.

Manipulating clouds without actually touching them, but just from speed. That's the 'trick' part, I assume.

There's a video somewhere on YouTube about a young fellow trying to put physics on the sonic rainboom. It's fun. In any case, the 'cone' you're seeing is the bow shock wave starting to form something equivalent to a Mach cone. The so-called sound barrier is mainly due to the fact that wave drag (drag produced by shock waves) exceeding the drag from the air's viscosity at the speed of sound, causing lifting bodies to behave differently. It gives the impression of hitting something as a sub-sonic-designed plane suddenly seems to fall out of the air because it's no longer generating enough lift to stay up. Being 'bounced' off the bow shock wave is probably an extension of pegasi unconscious cloud-walking abilities (as they can sleep up there, that ability has to be unconscious).

Rainbow Dash hates doors.

Cloudsdale, and the Best Young Flyers Competition. In most real life competitive events like this, Young means teenage or equivalent. This reinforces the idea that Rainbow Dash, the first of her class to get a cutie-mark, is probably the youngest of the Mane 6 by one or two years.

Twilight doesn't know what a Sonic Rainbow is, and Pinkie says she's not seen one before. Showing how rare this trick is. Yes, this is contradicted later in the series, but likely Pinkie simply didn't make the connection between what she saw previously and the Sonic Rainboom concept.

I was a roadie for a vaulting team (gymnastics on horseback) a couple of years back, as my wife was the coach, and one of the girls there was much like Rainbow Dash. Similar voice, athletic, but with a lack of confidence that led to putting up a front of ego.

Flutterpony!

So there's a spell to let non-pegasi walk on clouds. Which starts to wander into areas of magic being 'the solution to everything' and reducing the value of non-spellcasters.

Weather factory, where they actually manufacture snow, rainbows, clouds, etc.

Doctor Whooves! Yay! Pegasis? What? Usually regeneration produces more difference in appearnce than just the addition of more limbs... Though the voice is also different.

And Derpy, of course.

Icarus, of course.

The Wonderbolts need more practice at this kind of thing.

Nice detail in that Rarity never got the cloudwalking spell.