I find a certain perverse humor in Delta Air Lines response to the behavior of its “Delta variants”. Seriously, since when have groups who engage in behavior known to be riskier than normal not been charged higher insurance premiums than groups who behave more safely? This is effectively what Delta Air Lines is doing, with or without the cooperation of their medical insurer. Makes perfect sense to me and I wouldn’t be surprised if other employers follow suit now that there is a fully approved Covid-19 vaccine. Of course, the simpler and likely more common approach is requiring proof of vaccination as a condition of employment.