Flight is an icon theme for Android launchers. The intention is to create a series of unified monochrome variants for each app's logo to create a consistent, minimalist look.
Flight comes in two variants: A free "Lite" variant, and a paid "Pro" variant. The only difference between them is that Pro comes with additional icons.
While I understand the need to monetize your work if you spend time on something - especially art - the Flight icon theme is incredibly bare bones for what it's producing. Most of the icons can be replicated by simply stealing SVGs from Google Images or tracing them using the "Trace Bitmap" option in Inkscape. It would be incredibly easy to suppliment the free icon theme with additional icons made this way.
So anyway, I did that thing. Here they are.
Example screenshots
Screenshots use Nova Launcher.
Icons
Click the icon itself for a PNG. Click the text for the SVG.
If you're not sure which to grab, you want the PNG.

Dollar General
A self-owned general store, popularized by selling known brands at cheap prices by making up for the costs in other areas (often by inflating other brands' prices).

Doordash
The customer-facing half of the Doordash app duo. Used to place delivery orders for known food chains and stores.

GZDoom
Currently the most advanced Doom engine in production next to the Eternity Engine. I recommend using this icon for Delta Touch

KDE Connect
KDE Connect is a multiplatform service by KDE that allows users to sync content between their devices over a local network, such as files, clipboard content, or keyboard input.

Live Transcribe
A service using Google's voice recognition software to provide captions for the hearing-impaired.

Magic: The Gathering Arena
The digital incarnation of the trading card game by Wizards of the Coast.

Nextdoor
A social network unique in that it only allows users to communicate with other users in a specified physical location near or around their home.
Like Topix and Yik Yak
before it, Nextdoor has a reputation for allowing an informed minority - its users - to perform profiling and bigotry on people unaware of its existence.

Phelps County Bank
Also called PCB and MyPCB, a very small Missouri-centric banking chain associated with MasterCard.

QooApp
An alternative Android store, based upon providing region-free access to otherwise Japanese-exclusive mobile apps.

Retroarch
The (in)famous emulator frontend, designed to abstract and collate multiple emulators to a single easily-portable interface.

Riichi City
A Riichi Mahjong game by Formirai, and basically your only option for English competitive Riichi Mahjong if you're mad at Mahjong Soul for not getting meaningful QoL updates.

Roku
A combination streaming service, set-top box brand, and now smart home security manufacturer, Roku's app allows you to control TVs under their brand over WiFi or route their audio to your Android device.

SEGANET-MJ
A more fast-paced Riichi Mahjong application from Sega AM2. Originally a network-linked arcade cabinet.
Also called Sega MJ, Sega NetMahjong, セガNET麻雀 MJ, and Sega Networks Taisen Mahjong MJ

Sonic
"Drive-in" fast food chain with an emphasis on fast turnaround regarding order completion. Unique for not having an indoor seating area.

Staples
Office supplies and electronics department store. Business-oriented customers looking to order online are recommended to download the Staples Shopping App while in-store customers are recommended to use the Staples Connect app
for coupons and personalized shopping recommendations.

Steam Link
Remote desktop and cloud gaming service by Valve Software which connects users to their home desktop computers rather than anonymous servers.

Tusky
Mastodon-compatible Fediverse client designed to mimic the former client for the social network Twitter. Courted minor controversy when the app deliberately blacklisted users from signing into bigoted social networks like Gab.
Note: This icon is based on the former icon design for Tusky, rather than the new ones by Dzuk