Comparison of Insulin Degludec With Insulin Glargine U100 for Adults With Type 1 Diabetes Crossing Multiple Time Zones.

Subjects will use Insulin Degludec (Tresiba) with TRESIBA® FLEXTOUCH® pens as their basal insulin during a 9-10 hour flight, at each destination, and then during a return flight.

Subjects will use Insulin Glargine (Lantus) with LANTUS® SOLOSTAR® INSULIN PEN as their basal insulin during a 9-10 hour flight, at each destination, and then during a return flight.

Subjects will use Tresiba FlexTouch pens when using Tresiba as their basal insulin during a 9-10 hour flight, at each destination, and then during a return flight.

Subjects will use Lantus SoloStar insulin pens when using Lantus as their basal insulin during a 9-10 hour flight, at each destination, and then during a return flight.