Which airlines are okay for kohanim to fly on to Eretz Yisroel and is there a way to go to Tiveria thats not a problem for kohanim?
As per a conversation with Rav Lombard, (an expert in these halachos), he said that as of now (July 2022) the main issue is flying Elal from JKF, however the noon flight doesn’t have coffins. Additionally, Elal’s flights from Newark are ok. Regarding United and Delta, from Newark they do occasionally take coffin. If you need more information you can call R’ Lombard at 972-54-292-0903.
Regarding going to Teveria, you will need a map to show you which street and road are accessible for Kohanim and which aren’t. See below. There is a sefer called טהרת כהנים, (written by R’ Munk) which goes into these topics in detail. I would suggest that when you get to Eretz Yisroel you get the sefer or call the author at 02-5862153.