JagUTD is right they don't hold the same quality but when they were sold on the NYSE they were advertised as having the same value, each share category, A and B, having the same value, receiving the same dividend.
Malcolm sold off 10% of United as A class shares. They were valued as representing 10% of the club.
What would the Glazer's say - they were never worth the same as class B, we lied?
The Glazer's have tried to take the proverbial, and have with us fans, but these A class investors are a different category of individuals and it is time to pay up.
Regardless, the board must act in the best interest of each shareholder, there should be no preference for one group over another. There shares are equal:
"The rights of the holders of our Class A ordinary shares and our Class B ordinary shares are identical"
from the sales prospectus -
https://www.sec.gov/Archives/edgar/data/1549107/000104746912007537/a2210287zf-1a.htm