Still no mention of companies operating these types.
'Companies' operating these specific types don't make a difference, one dot right, as the engine specifics don't change with operating companies.
Of course, if you had operated the types I specified, you would know this.
That you don't only leads to the conclusion that you (specifically) are misinformed.
No surprise there.
Now, if I were to mention 'Willair International', and you had been around in 1970, when this company was operating 1649 Constellation aircraft transPacific
(been there, done that) it simply wouldn't help your learning process, such as it is...
