First Class Flying

Evidence

Ran on Kiln's test stand (2026-11-04): FirstClassFlyingMod did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload; FirstClassFlyingClient did not start: java.lang.NoClassDefFoundError: net/minecraft/nbt/Tag.

What it needs from Kiln

• Mixin
• com.mojang.blaze3d.vertex.PoseStack
• com.mojang.blaze3d.vertex.PoseStack.Pose
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.Context
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.resource.v1.ResourceLoader
• net.minecraft.client.Camera
• net.minecraft.client.Options
• net.minecraft.client.model.geom.ModelPart
• net.minecraft.client.resources.sounds.AbstractTickableSoundInstance
• net.minecraft.client.resources.sounds.SimpleSoundInstance
• net.minecraft.client.resources.sounds.SoundInstance
• net.minecraft.client.resources.sounds.SoundInstance.Attenuation
• net.minecraft.client.sounds.SoundEngine
• net.minecraft.client.sounds.SoundEngine.PlayResult
• net.minecraft.client.sounds.SoundManager
• net.minecraft.core.NonNullList
• net.minecraft.core.RegistryAccess
• net.minecraft.nbt.CompoundTag
• net.minecraft.network.codec.ByteBufCodecs
• net.minecraft.network.codec.StreamCodec
• net.minecraft.network.protocol.common.custom.CustomPacketPayload
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.Type
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.TypeAndCodec
• net.minecraft.server.MinecraftServer
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.server.packs.PackType
• net.minecraft.server.packs.resources.Resource
• net.minecraft.server.packs.resources.ResourceManager
• net.minecraft.server.packs.resources.ResourceManagerReloadListener
• net.minecraft.server.players.PlayerList
• net.minecraft.world.entity.EquipmentSlot
• and 59 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Machines (0.4), Mixin (0.5)

In the author's words

FCF is a highly configurable elytra enhancement, compatible with do a barrel roll and fresh player animations.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file first-class-flying-mc26.3-1.2.1+port.20261019.jar. The scan reads the mod's classes; it does not run them.