Williams, who at 1.94m is one of the tallest in the squad, was sitting in economy seat 39F, as evidenced by a photo he posted on his twitter account which is followed by 573,000 people.
Tietjens' team, who won the latest two tournaments in Wellington and Sydney in dramatic style, are currently first equal in the 10-round series alongside Fiji and South Africa. After the Las Vegas tournament, which starts on March 4, the squad will travel to Vancouver for the sixth round which starts on March 12.
The Rio Olympics in August will include sevens rugby for the first time since 1924, and New Zealand players and rugby-supporting public are probably entitled to ask whether send large athletes on long-haul flights in economy is the best way for them to prepare.
New Zealand Rugby's mission statement includes the winning of gold medals by the mens' and womens' teams.
When asked about the travel arrangements, a New Zealand Rugby spokesman said they were looked after by World Rugby, who have yet to respond to Herald inquiries for comment.
There was no response from New Zealand Rugby when asked if the organisation had the potential to upgrade the players' seats, or whether NZR representatives would fly economy class on long-haul flights when attending to official business.
World Rugby made a surplus of about $300 million from the recent World Cup, the most commercially successful tournament since its inception in 1987.
However, it appears the New Zealand players are only the latest sevens players getting what some might describe as a raw deal from World Rugby.
Samoa sevens coach Damian McGrath was given what he described as a "slap on the wrist" for publicly criticising his team's travel schedule following the Wellington tournament in late January.
After the tournament the Samoa players had to be ready at 3am to catch a flight to Sydney, only seven hours after playing their final match at Westpac Stadium. What made matters worse was that on arrival the players weren't able to check in until 2pm local time; meaning many of them slept on the lobby floor for up to six hours before being able to enter their rooms.
McGrath, who posted a picture on social media of the players on the floor, said: "The situation just escalated into a real farce and we had the conversations with the powers that be and they said I shouldn't have spoken publicly about it. I just felt that I had to say something because, it really was terrible how we were treated."
