What are some of the disadvantages of airline alliances?

Question

What are some of the disadvantages of airline alliances?

Answer 1

dont know if this will answer your question, as we all know fuel prices soaring high  nowadays, so if one member airline increases its fare all or some member airline will also tend to increase its fare or any surcharge to compensate depending on the by laws, regulations  or rules that govern their alliance

Answer 2

very good point Jude cause  I was thinking there is no disadvantage but you got it but then again they can off set this if they really want to, I mean let us say TG (Thai Airways) has not much passenger going to Frankfurt then they can just (ahead of time announce) give their passengers to Lufthansa another Star alliance member and just get their 20 or 50USD/head of their passenger like what they do in code sharing.

What I mean is no need to increase fare just help each other like  code sharing one member will cancel his flight to give way to another member.