Delta air lines will continue to block middle seats on all flights through 30 April 2021.
The airline is the only major one still keeping middle seats free, a practice it started last year during the height of the pandemic.
The carrier had previously vowed to block middle seats until the end of March.
"We want our customers to have complete confidence when traveling with Delta, and they continue to tell us that more space provides more peace of mind," said Bill Lentsch, Chief Customer Experience Officer.
"We'll continue to reassess seat blocking in relation to case transmission and vaccination rates."
It allows customers to 'confidently plan and book their spring travel.'
The month extension means Delta has been blocking seats for a full year.
Most other US carriers also limited cabin capacity by blocking middle seats but have since discontinued this.
Accor has launched a global rollout of its digital room key solution, dubbed Accor Key, with the aim of providing a contactless guest experience at its properties.
Hyatt has launched a new long-stay offer to allow digital nomads the chance to work and stay in its properties.