pronunciation of 'contractor'

[LiuJing]

According to dictionaries, con in 'contractor' as in a construction contractor can be pronounced in rhyme with both 'conference' and 'construction'.

But I hear everyone pronounce it in rhyme with conference. Have you ever heard people pronounce it in rhyme with construction? Thank you.

[5jj]

It’s /kənˈtræktər/ for me.

[Barb_D]

I've never heard it said with the same opening sound as in construction.