With the jack out front, it looks like they are going to raise the aircraft up sufficiently to install the jack under the wings - presumably there's also one on the other side, jack it up, then lower the undercarriage and if there is no damage to the gear, lower the aircraft onto its own wheels. The tanker looks like its there to steady the aircraft while air bags are being inflated. The flaps are down, so naturally the air bags can't be placed right under the wing; the flaps would get damaged as they couldn't take the strain of the air bags. Flaps would probably be inspected and retracted as well, depending on their condition. The air bags would be inflated only sufficiently to enable the jacks to be installed under the wings.