Many aircraft do not have enough storage space to securely stow the number and size of bags brought onboard by the increasing number of passengers. In response, Continental Airlines spent over $12.4 Million to retrofit its entire fleet to increase aircraft carry-on-storage capacity. United Airlines responded differently. Despite customer dissatisfaction, United imposed strict limits on the size and number of bags its passengers were allowed to carry onto its aircraft. Then, over Continental's objections, United convinced AMC, the managing authority at airport X, to install carry-on baggage template at its two security checkpoints. The installation of the templates effectively restricted the size of carry-on bags for the passengers of all carriers at airport X. Continental sued United and AMC (an unincorporated association of all the carriers that use airport X).

Q: Represent United and AMC and justify their actions in line with the existing Anti-trust laws. In addition, please provide at least 5 reasons against the existing anti-trust laws.