What is the nearest airport and car rental to the Observatory?
There isn’t a “nearby” airport. For private aviation there are airstrips in Marfa and Alpine (both about 40 miles from the Observatory). Both have car rental services. For commercial flights, the nearest airports are in El Paso (185 miles) and Midland-Odessa (170 miles). Although you can count on roughly 2.5 to 3 hour drives from either, when driving from El Paso you’ll lose an hour going from Mountain time (El Paso) to Central time (McDonald).