As I may have explained in my earlier posts on this subject, LMC's are no longer allowed by most airlines. The reason is several of those involved in the Sep 11 attacks got onboard as LMC's. Because an LMC has to be processed quickly security checks on these passengers cannot be done as thoroughly as would be liked. To make the industry a safer place for everyone LMC and "have a go" are a thing of the past.
Once again, get to check in on time, thousands manage it each day.