Most airliners have the wing spars attached to a rigid wing spar box at the fuselage. It is just as strong as a carry-through spar, and leaves room in the fuselage for fuel/baggage/accessory systems. It also saves weight of what would be the biggest and heaviest part of the spar running through the center of the plane. With smaller planes it's not such a big factor and they often do have continuous spars.
One smooth landing is skill. Two in a row is luck. Three in a row and someone is lying.