An ex-Mexicana 727, previously XA-CUE. Note the unusual slightly raised roofline on the rear fuselage. This is a modification which was made to 12 of Mexicana's 727s, known unofficially as a 727-200/JATO. These aircraft were fitted with a solid-fuel rocket engine under the fuselage, strictly for emergency use only at hot/high airports. This necessitated the repositioning of some radio and electronic systems to a new equipment bay in the upper rear fuselage.