Which method can be used for opening the airway besides head-tilt?

The jaw-thrust maneuver is a valuable technique for opening the airway, especially in situations where a spinal injury is suspected. This method involves using the fingers to push the jaw forward without tilting the head or neck, which helps maintain the alignment of the spine while allowing for access to the airway. It is particularly effective in unconscious patients who may have obstructed airways due to the tongue or soft tissues.

In contrast, the other methods listed are not primarily aimed at opening the airway. Mouth-to-mouth rescue is a method of providing rescue breaths but requires that the airway is already clear. CPR is a life-saving procedure performed when someone's heart has stopped, which includes chest compressions and rescue breaths but is not specifically for airway maintenance. Absorption is not relevant to airway management in this context, as it doesn't pertain to techniques for opening or clearing the airway. Thus, the jaw-thrust maneuver stands out as the correct alternative method for airway management aside from the head-tilt technique.