ORD is by far the worse. Outside of the RCC, there are a total of four - count em, four - usable power ports in each concourse of Terminal One. At each end of B and C, where they go into the half-circle, next to the UA Arrivals and Departures monitor there are two chairs and in front of them two power ports on the floor.

No other power port in that terminal works. Perversely, Terminal 2 (UAX) has plenty all over the place.

LAX sucks about as hard.

SFO and DEN are both fantastic, with plenty of ports near chairs. SEA and IAD are decent, as well. Most other airports are fair to middlin. No problems at BWI, GSO, BNA, or BOS.