there's always one somewhere....this stupid practice was a regular "union boy" tactic during both the CO strike, then later at EAL NOT ENCOURAGED OR ENDORSED BY ALPO..to set the record straight, but nonetheless practiced by many less than professional airline pilots...over atc frequencies, but most commonly on company frequencies, blocking important transmissions such as weight and balance close-outs, stab and flap settings for take-off...not a good thing...