Open discussion of salaries is a taboo issue in general; even within a company, private discussion of salary is almost universally discouraged. Many firms have very strict policies on the matter. I've worked for several such companies.
Discussion about universal seniority based salaries, however, is common in the airline business. Someone who shows up to an interview unaware of the pay scale has done far too little research, and an airline which doesn't make this information available is virtually unheard of...comparisons of salries abound in the business.
I might suggest that this has been covered many, many times on this site, and a simple use of the search feature, and some careful reading will produce evidence of the pay scales having been posted again and again. Rather than ask for it once more, why not investigate a little to see what's already here? You'll find a lot of other good information on CX while you're at it.