Airships

The Lavender Spirit Airship and Lilac Sky Airship are two lighter-than-air airships featured in the series. They appear in several episodes, but they are only named in other media.

Season two
The Lavender Spirit first appears in Sweet and Elite. Rarity, Fancy Pants, Swan Song, Four Step, "Caesar", and Sealed Scroll ride the airship during the song Becoming Popular (The Pony Everypony Should Know), and Rarity christens the airship for its maiden voyage at the end of the song.

Season three
The Lilac Sky first appears in Apple Family Reunion. Wensley, Gala Appleby, and Apple Cinnamon arrive to the reunion at Sweet Apple Acres using the airship, and they return home using it as well.

Season four
The Lilac Sky appears flying through the Maretropolis sky in Power Ponies.

My Little Pony (mobile game)
The Lavender Spirit and Lilac Sky both appear, and are named, in Gameloft's mobile game, offered as rewards for completing certain character collections. The Lavender Spirit is rewarded for completing the "What's Hot" collection consisting of Fine Line, Lemon Hearts, Night Glider, Peachy Pie, Silver Shill, and Upper Crust. The Lilac Sky is rewarded for completing the "Lifelong Friends" collection consisting of Twilight Sparkle, Lemon Hearts, Twinkleshine, Moon Dancer, and Minuette.

Merchandise
The Lavender Spirit is featured on the Season 2 poster.