>If we want to stop fare practices we do not agree with then mandating specific bundling in luggage, legroom, food and credit/rebook is available as a regulation.

Let's take the one of the items as an example: I rarely rebook, so I'm presumably benefiting from this price discrimination. Why should I support that it be forcibly bundled? I might be sympathetic to having some sort of baseline fare for advertising purposes, so it's not a race to the bottom to get the lowest sticker price, but I can't see how it's justified to limit consumer choice by disallowing the sale of restricted fares.