You can be very certain what international flights depart T2, it is the arrivals that are uncertain.

This should be plenty of time as long as there is no delay. ANA will check the luggage through across separate tickets. But do leave some time for that exercise. Don't expect to show up the usual 30 minutes before a domestic flight.

HND T1 to T3 (bus or Keikyu)
 

We have a 95 min connection.
Anyone have advice on which method would be faster? My thinking is that the Keikyu would be faster?
Bus would take longer to load and unload, bus travel time is longer.
If my connection is tight enough I would just avoid getting the free Keikyu ticket and pay for the short distance.

There is a bus from airside domestic to T3, bus gates 91 (south wing) bus gate 30 north wing. There is the landside terminal bus, or you can take Keikyu or the monorail lines.

The shortest ride time will be Keikyu, I am not sure the shorter walktimes to the airside departure points make up the difference. So the main point in time spend will probably be how long you have to wait for a departure.

The Monorail might be faster, depending on departure times. I would just use Google maps to find the fastest option when you're ready to go.

I only see the airside buses referred to on the JAL website and nowhere else. Are those still running?

Yes it is still running. But it will drop you landside in T3, as you need to pass security and immigration checks.

We will fly next year from Europe to HND in business. Then on to ITM on a separate ticket. All flights on one PNR was not offered by the airline.
Arriving end of August 2025 at around 10.30. I am considering a flight by ANA four hours later, will that be an overkill or will five or six hours connection time be safer?

Four hours seems safe to me. Six feels like packing an extra raincoat.

If your ex-Euro flight is with NH or JL, then you are for sure ok with 4 hours. I did that with JL allowing 6 hours for transit and I got 4 hours left to spare.

Thank you. No, we will be flying ITA which does not have Japanese alliance partners.

Hi,

I agree that 4 hours should be ok ( once I had a 6 hour layover - separate tickets but as it was a nice day after dropping bags off for the domestic leg, i took the monorail to tokyo and walked around a beautiful garden
I think that ITA may join star alliance in due course ( so ANA would be a partner) but these take time and unlikely to be in place for Aug 2025

Regards

TBS

Does it make a lot of difference whether you arrive on a Japanese airline?

It makes a difference on separate tickets on non-partners (alliance or historic), mostly because they don't know you're coming. It's been a while but I seem to remember that if your baggage is checked through, then they know you're coming. You should be able to ask the staff meeting the flight even if your name isn't on their sign, it doesn't guarantee that they'll be able to do very much for you. Given the Japanese service culture, they usually will at least point you to someone who can help.

Thanks for the helpful responses: I did go for a four hour connection. The longer the layover, the later we will arrive at our hotel. After landing I have to collect the car and to drive to Wakayama.

When the luggage is checked through across separate tickets the receiving airline does not know about it until the luggage gets scanned in by the baggage handlers. It needs to go in to the central luggage system before that happens. The ground staff meeting the inbound flight will have no idea that you are connecting.