Train stations, airports and expressways were crowded Sunday as the majority of travelers returned from their summer vacation.

Although many visited their hometowns or elsewhere during the first summer holiday season in three years without COVID-19 restrictions on domestic travel in place, the operators of some transport networks reported sluggish sales as the country continues to grapple with a seventh wave of infections.

However, long lines formed at security checkpoints, especially before the departures of Tokyo-bound flights, with vacationers seen nearly shoulder-to-shoulder in souvenir shops at Fukuoka airport in southwestern Japan.

Kyoko Ito, a 41-year-old Tokyo office worker, made sure she had a negative PCR test before traveling to her family home in Fukuoka. "Since there are no restrictions on movement, I could spend my time without worrying what people around me thought."

Her 7-year-old-son, Satoshi, said he spent time catching cicadas with his grandfather.

Tokyo Station's shinkansen bullet train platforms were also bustling. Miki Hisamochi, 40, had just returned from visiting her parents in Nagaoka in Niigata Prefecture.

Hisamochi attended the Nagaoka fireworks festival, held for the first time in three years after being cancelled due to the pandemic, saying, "It moved me because it was very beautiful."

"Grandma's cooking was delicious," Hisamochi's 5-year-old daughter Fumi said.

Several rail operators said that reservations for shinkansen and other rail lines in the one-week period from last Wednesday were 2.69 times higher than the same period in 2021, recovering to about 60% of the pre-pandemic level seen in 2018.

But East Japan Railways said that reservations slowed from August as the nationwide number of COVID-19 cases remained high.

Airlines in late July said reservations for domestic flights between Aug. 6 and 16 were 1.7 times higher than the same period in 2021, with a total of 2,998,000 passengers.

Highway operators also forecast traffic congestion in various locations across Japan on Sunday.