Add Error-catching to flights retrieval. #3
Refactor config.json load with better error-catching. #3
Fix config_file.close typo.
Fix Error Exits.
Fix one more Error Exit.
Fix typo in config.json error message.
Add error-handling to flight selection. #3
Add tacky startup banner.
Refactor some error handling. #3
Add "pausing" message.
Add scary "ERROR: " prefix to error message to alert user. #3
Minimise library imports.