The reflection coefficient hits 100% exactly at the critical angle. More rigorously, consider that an analysis of the boundary conditions at the interface requires that the two polarizations of light have reflectances:
Distance from Ruskin, FL to Palmetto, FL 18 Miles or 29 Km. How many hours? 24 mins
They can rent a car and drive through the traffic themselves. I'd rather pay the extra $130.00 for them to fly into PSP than face two hours+ in each direction on hwy 10. The one way distance between Ontario airport and Palm Springs airport is 72 miles. Palm Desert is another 18 miles from Palm Springs airport. If you must drive try hwy 60 from Ontario to Beaumont where you intersect hwy 10 just west of PS. It's not two hours driving time Ontario to Palm Springs.