Its been 1.5 years since COVID-19 struck us. Air travel had completely come to a halt when many countries announced border closures. Airports were left empty and airlines had to cut flights and retrenched staff as a result.  However, things seem to changed recently with higher rates of people being vaccinated. In the US, their government have started to relax measures and air travel is definitely back in the United States. Their airports are full again and flights are also full. This is a stark contract from last year where airports are empty and flights were relatively empty too. Studies have shown that higher vaccination rates reduces COVID-19 infection rates significantly as seen in the chart below. Minister Lawrence Wong has also said that "With a higher vaccination rate, compliance with social distancing and safe management measures, regular testing, and faster and more comprehensive contact...