Here fireblight is present. A local orchard lost their crops on Northern Spy one year. I haven’t really seen fireblight on my apple trees with the exception of one tree that suddenly died but I suspect that was probably a root issue of some type but it is hard to be sure.
On the other hand I have a large Cleveland pear ornamental tree right next to the orchard. This year it was covered with fireblight strikes but nothing showed up on the apple trees. I did pick apple trees and rootstocks that had resistance to fireblight and that probably helped. Also my trees are almost all on dwarf rootstocks… I don’t have large trees that tend fare well with fireblight strikes.
If you have fireblight in your area I think you would want to pick trees and rootstocks that have some resistance to fireblight. Also resistance does not mean immunity. A resistant tree can die from fireblight if the disease pressure is intense, or it is weakened by poor health. Here are some charts that list fireblight resistance.
However, I will caution you sources don’t always agree on the level of resistance. I think this is due to various factors, field studies being done in different areas of the country, different fireblight strains, etc. But the charts are still pretty useful.
Disease Susceptibility Ranking of Apples – Database of Apple Diseases
https://www.extension.purdue.edu/extmedia/BP/BP-132-W.pdf
Table of Apple Cultivar Fire Blight Susceptibility – Apples
https://treefruit.wsu.edu/article/fire-blight-susceptibility-of-apple-cultivars/
https://blogs.cornell.edu/khanlab/extension/fire-blight-susceptibility-of-common-apple-cultivars/
I think Alan already posted the last one from Cornell but I went ahead and included it as it was on my list. Plus I think the WSU link above is a really good study with lots of detail.