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there are planes that fly near sonically, large commercial liners like b 747 can reach M =.85



nearsonic flights are anywhere between M= .8 and 1.2

at these speeds shock waves start to form, increasing as a result the drag, which reaches a maximum

value at M = 1

this drag decreases as M increases to supersonic values

So u can see why even supersonic flights are more favorable than sonic speeds


however


there are ways to overcome this drag increase, perhaps without having to increase the engine size, like using supercritical airfoils, area rule, wing sweep, and thin airfoils.