If no resistance of the either endotracheal tube during advancement into the oropharynx is noted it will be defined as "smooth", and will be inserted into the trachea using direct laryngoscopy. In patients assigned to the Parker Flex-Tip endotracheal tube, the stylette will be withdrawn from the tube immediately after the tube passes through the nasopharynx and the tube will then be advanced into the trachea by direct laryngoscopy. If resistance is noted on insertion of either ETT it will be recorded as "impinged" and a mark will be made on the tube corresponding to the depth of insertion into the nostril to allow the distance between the tip of the tube and the mark to be measured. The assessment of the ease of insertion will only be made on the first attempt, with no manipulation applied against resistance.