May passenger data from HAS shows that both George Bush Intercontinental Airport in the Humble area and William P. Hobby Airport in southeast Houston saw a significant decline in year-over-year travel; however, the airports saw a 109.31% increase in travel month over month, from 242,583 total passengers in April to 507,750 in May.
IAH passenger data took a 90.8% decline year over year, from 3.93 million passengers in May 2019 to 361,035 passengers in May 2020. HOU saw an 88.41% passenger decline, from 1.27 million in May 2019 to 146,715 in May 2020.
Despite the year-over-year change, each airport saw about double number of passengers in May than in April. IAH's travel increased 99.7% between April and May, while HOU increased 137.41% month over month, per HAS data. HOU's May data only includes domestic flights, as there were not any international flights.