. Subgroup B2 (N= 15) - Patients will be intubated using styletted endotracheal tube the Gliderite (Teleflex Medical, Hudson RCI/ Sheridan/ HBT). In the operating room, standard monitoring devices will be applied including a pulse oximeter, 3 lead (at least), ECG and blood pressure cuff; the latter could be invasive or non-invasive depending on the nature of the surgery. Baseline measures of BP, pulse, oxygen saturation, and CO2, will be made. The time will be noted before any sedation or anesthesia is administered. Vital signs will be recorded every minute from the time that induction of anesthesia is begun until five minutes after the patient has been intubated, and then at five-minute intervals thereafter for fifteen minutes. General anesthesia will be induced by bolus administration of propofol (2mg/kg) and fentanyl (1mcg/kg), and maintained with an inhalational agent. Rocuronium (0.6 mg/kg) will be administered to provide muscle relaxation and a mixture of sevoflurane or isoflurane and nitrous oxide will be utilized for maintenance of anesthesia once the ability to mask ventilate is confirmed. The lungs will be mechanically ventilated with a semi-closed circle system to maintain an end-tidal CO2 near 35 mmHg. Patients' lungs will be ventilated via anesthesia mask 100% oxygen until the patient is completely relaxed. All investigators will be trained based on manufacturer recommendations and each resident will perform at least 3 intubations with McGrath laryngoscope and 3 intubations with Cobalt GlideScope (total of 6 intubations) prior to enlisting any patients for the study. The CA-2 and CA-3 residents will be performing the intubations. The external neck pressure may be applied by an assistant in an attempt to improve exposure of the larynx. The ease of intubation will be recorded in terms of the number of attempts (measured as either the reinsertion of the blade or endotracheal tube) and the intubation time (time the laryngoscope blade enters the mouth until 1st capnograph breath) will be recorded. If more than 2 attempts were needed, a third attempt can be made with the device used in the other group. If still unsuccessful, the direct laryngoscopy/ flexible fibreoptic laryngoscopy will be performed to intubate the trachea and the case will be deemed a failure. The subjective level of difficulty (from 0 = Extremely Easy to 5 = Extremely Difficult) in the performance of intubation will also be recorded. An alternative technique will be used in case the intubation fails. 1. Use of the Glideride stylet if using an Endotrol tracheal tube, if the Endotrol tracheal tube is not able to get towards the cords. 2. Use of a regular stylet instead of the Glideride especially with McGrath if Glideride not able to help with intubation 3. Use of macintosh or miller appropriate blade with styletted or Endotrol tube if intubation with videolaryngoscope is difficult 4. Use of LMA or similar device in case intubation is difficult with any of the previous devices and application of a difficult airway protocol. B. Measurements- We will record morphometric characteristics of all patients. The quality of the airway will be evaluated using the Mallampati and Wilson scoring system, thyromental scoring system of Patil, interincisor gap distance, neck mobility and sternomental distance.