Positioning during the process of tracheal intubation is critical, as optimal positioning can greatly facilitate successful intubation. Many complications can occur as a result of failed intubation, ranging from airway injury, lack of oxygen, with even deaths. Today, the most popular positioning of patients for intubation is in the "sniffing" position. There is however evidence to support that intubation in the bed-up-head-elevated position may be better. In today's technological age, video assisted laryngoscopy (Laryngoscopy is the process of visualizing the vocal cords prior to intubation), a new method where the anaesthetist intubates a patient via aid of an image guided view of the airway, is increasingly popular due to its reliability and superiority to normal intubation. However, it is not widely available, and may suffer from technical breakdowns. The Glidescope is one example of a video laryngoscope, and has been widely researched in the medical literature. In this study, the investigators wish to investigate whether intubation in the bed-up-head-elevated position will be as good as, if not better than Glidescope assisted tracheal intubation, in patients undergoing elective surgery and planned for general anaesthesia.

Inclusion Criteria:

1. Patients undergoing elective surgeries under general anaesthesia
2. Patients aged from 18 years old to 75 years old
3. Patients who are able to give informed consent

Exclusion Criteria:

1. Patients with airway obstruction
2. Patients with contraindications to neck extension
3. Patients with small mouth opening (<3 cm)
4. BMI > 35 kg/m3
5. Patients with ischemic heart disease, cerebrovascular disease and respiratory diseases
6. Patients in whom rapid sequence induction is indicated

Investigator is blinded to the initial laryngeal exposure during the sniffing position, but is unblinded during assessment of laryngeal exposure in either the bed up head elevated position or glidescope assisted tracheal intubation