To meet passengers needs and manage their airlines effectively, airlines make changes. If your dream — and plan — is to make commercial aviation your career, you may find some of these changes ineresting. Here's snippets of what's happening this past month: JetBlue's market share has risen to nearly 11% of the US market because of expansion into new markets in the US, Mexico, Dominican Republic, the Bahamas and Costa Rica. Spirit Airlines is now flying to Sao Paulo, Brazil. The single biggest international market is still Canada, and this winter Aair Canada, Air Transat, Sunwing and Westjet are flying Canadians down to various cities in sunny Florida.