My husband and I have booked a 15 day cruise from LA to Hawaii this coming March. We will be flying from Memphis to LA with a stop in Denver. He had pneumonia this past spring. He is 80 and has fully recovered. He exercises regularly but still tires easily but no shortness of breath. He also has COPD, a pacemaker and on Eliquis. He has had a flu shot and pneumonia shot. Would he be too high a risk to make this trip?