Cabo with a 3 month old?

Danielle • Mama to an 8 year old and one on the way!
So my parents gave us a Christmas gift of flying the whole family to Cabo San Lucas for a week. At the time they want to go our daughter will be 3 months old? I need to talk to her pediatrician about her thoughts, but my husband says no. However, with my first child I took her on a trip to 3 different countries when she was 5 months old and she was fine. Thoughs?