[FG28_Kodiak]

Possible are:

AircraftType.DiveBomber
AircraftType.Bomber
AircraftType.AmphibiousPlane
AircraftType.TorpedoBomber
AircraftType.Transport
AircraftType.BNZFighter
AircraftType.Fighter
AircraftType.Glider
AircraftType.HeavyFighter
AircraftType.JaBo
AircraftType.SailPlane
AircraftType.Scout
AircraftType.Sturmovik
AircraftType.TNBFighter
AircraftType.UNKNOWN

So the only way is to test all playable planes with
GamePlay.gpLogServer(null, "AircraftType: {0}", new object[] {(actor as AiAircraft).Type()});

Example

using System;
using System.Collections;
using System.Collections.Generic;
using maddox.game;
using maddox.game.world;

public class Mission : AMission
{
public override void OnPlaceEnter(Player player, AiActor actor, int placeIndex)
{
base.OnPlaceEnter(player, actor, placeIndex);

GamePlay.gpLogServer(null, "AircraftType: {0}", new object[] {(actor as AiAircraft).Type()});
}
}

and so test which type a plane can be and then divide it into groups.