DALLAS — A coalition of budget carriers announced Tuesday the commercial launch of the Upright fare tier, a new cabin class positioned below Basic Economy that allows passengers to fly at significantly reduced prices provided they remain standing for the entirety of their journey, do not make eye contact with seated passengers, and acknowledge in writing that they have "no further requests at this time."

The Upright cabin, located in the rear third of the aircraft, accommodates up to sixty additional revenue passengers per flight using a grid of overhead grab straps modeled on municipal transit infrastructure. Each standing position includes a small fold-down shelf rated to support one personal item and one standard four-ounce bag of pretzels, which is not included in the fare.

"We asked ourselves: what is the absolute minimum a human being requires to be technically transported from one city to another?" said Bryce Lonnegan, Senior Vice President of Ancillary Revenue Architecture at FlyFwd Holdings. "The answer, it turns out, is a strap and a floor. Everything else is a luxury add-on."

Fares for the Upright tier begin at $19 for domestic routes under two hours, rising to $41 for transcontinental flights. Passengers wishing to board the aircraft before the standing section fills to capacity may purchase FrontStrap priority access for an additional $34, which guarantees a grab strap within the first four rows of the standing zone and proximity to a window, through which they may look but not lean.

"The shelf is genuinely thoughtful. You can rest a pretzel bag on it, or your phone, or a small amount of grief."

Restroom access is available to Upright passengers during designated windows, specifically the twelve-minute period following the seatbelt sign extinguishing and a second window of up to four minutes before initial descent, subject to aisle traffic and the discretion of the lead flight attendant. Use of the restroom outside these windows is available for a $9 convenience fee, billed automatically to the card on file.

The announcement has drawn cautious praise from industry analysts, several of whom noted that the Upright tier represents a logical endpoint of a fare-unbundling trend that began roughly two decades ago with checked baggage fees and has since claimed legroom, carry-on allowances, the ability to select a seat, and, on certain carriers, the option to receive a boarding pass that includes one's name.

Dr. Fenella Carrow, Associate Professor of Aeronautical Consumer Degradation Studies at the Whitmore Institute for Applied Hospitality Research, said the new tier raises important regulatory questions but admitted the economics were "essentially bulletproof."

"Passengers have demonstrated, repeatedly and at scale, that they will accept nearly any condition if the base fare is low enough," Dr. Carrow said. "At $19, you could probably ask them to hold the beverage cart."

Upright fares go on sale Friday. The carriers noted that seat upgrades will be available at the gate for $189, or $210 if you ask nicely.