If you get time to spot in LAS and have a car, there is a spotters parking lot on Sunset Road, at the corner of Escondido Street (in between the traffic light intersections of Paradise Road and Spencer Street), with great views of the terminals, take-offs, landings with the Las Vegas Strip and mountains in the background.
If you don't have a car, access by public transport is possible, by taking a "Strip & Downtown Express" bus southbound on the Strip to the South Strip Transfer Terminal, then a Sunset Road 212 bus east.
__________________
.
|