fly command allowing anyone to fly might not work not sure

src/main/java/net/minecraft/server/EntityPlayer.java

@@ -29,6 +29,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     private ItemStack[] bN = new ItemStack[]{null, null, null, null, null};
     private int bO = 0;
     public boolean h;
+    public boolean flightAllowed;
 
     public EntityPlayer(MinecraftServer minecraftserver, World world, String s, ItemInWorldManager iteminworldmanager) {
         super(world);
@@ -65,6 +66,18 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     public org.bukkit.Location compassTarget;
     // CraftBukkit end
 
+    @Override
+    public void a(NBTTagCompound nbttagcompound) {
+        super.a(nbttagcompound);
+        this.flightAllowed = nbttagcompound.m("FlightAllowed");
+    }
+
+    @Override
+    public void b(NBTTagCompound nbttagcompound) {
+        super.b(nbttagcompound);
+        nbttagcompound.a("FlightAllowed", this.flightAllowed);
+    }
+
     public void spawnIn(World world) {
         super.spawnIn(world);
         // CraftBukkit - world fallback code, either respawn location or global spawn

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -425,7 +425,7 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
 
             AxisAlignedBB axisalignedbb = this.player.boundingBox.clone().b((double) f4, (double) f4, (double) f4).a(0.0D, -0.55D, 0.0D);
 
-            if (!this.minecraftServer.allowFlight && !worldserver.b(axisalignedbb)) {
+            if (!this.minecraftServer.allowFlight && !this.player.flightAllowed && !worldserver.b(axisalignedbb)) {
                 if (d6 >= -0.03125D) {
                     ++this.h;
                     if (this.h > 80) {