Should you be crossing time zones or travelling for a long time, specific advice as to adjusting insulin regimes can be sought from the hospital teams and Diabetes Specialist Nurses. Take your flight schedule and information regarding time zone changes to assist with the planning of the timing of injections.
Visiting areas at high altitude can make insulin expand and contract, causing air pockets within the cartridge or pen. You may need to take a few "air shots" to ensure that there are no air bubbles present when you inject.
On the other hand, you can use a syringe and needle; hereby you can draw insulin out of a cartridge.