Inclusion Criteria:  Elective surgery patients without neck and face trauma Undergo surgery requiring general anesthesia with endotracheal intubation Patients with physical status ASA I-III Patients aged 18-65 years Nutritional status (BMI < 35 Kg/m2)  Exclusion Criteria:  Patients refusal to be included in the study Patients with cervical spine instability Anatomical and structural abnormalities of the maxillary teeth Thyromental distance <6 cm and inter-incisor distance <3.5 cm History of difficult intubation LEMON criteria ≥ 3