We have an international transit at BLR airport with Lufthansa -> Sri Lankan on the way from Munich to Colombo and Sri Lankan -> Lufthansa on the way back from Colombo to Munich. All flights are on one ticket/PNR and in business class.

I have some questions regarding this because the information on the internet is sparse.

1: Will LH and UL interline, and trough-check luggage? If so, can we stay in the international part of the airport (and therefore won't need a visa)? Do we need to go to a transfer desk?

2: Does Sri Lankan have a (contract) lounge in BLR, if so, which one? If not, is Priority Pass accepted in the 080 international lounge? (because the PP website only mentions a domestic lounge in T2)

3: The Lufthansa website says the following about the 080 lounge: *** Access to the lounge only 3 hours prior to the scheduled departure of the flight. Entry permitted only with invitation card, which is provided at the Lufthansa check-in. *** How do we get this invitation card when we are transiting? At the transfer desk? Our connection time is 6 hours, will we really only be permitted 3 hours before the flight, or is there an exception (like normally) for transit passengers?

4: I did read something about a business class part of the 080 lounge, will we have access to this with our Sri Lankan and/or Lufthansa flights?