EnableFlyCmdMangosZero01.cpp

//src\game\object\Player.cpp
void Player::SetCanFly(bool enable)
{
    WorldPacket data;
    if (enable)
        data.Initialize(MSG_MOVE_START_SWIM, 12);
    else
        data.Initialize(MSG_MOVE_STOP_SWIM, 12);

    data << GetPackGUID();
    data << uint32(0);
    SendMessageToSet(&data, true);

    /*data.Initialize(MSG_MOVE_UPDATE_CAN_FLY, 64); //hope we can skip this
    data << GetPackGUID();
    m_movementInfo.Write(data);
    SendMessageToSet(&data, false);*/
}