Delta Air Lines Inc. and Grupo Aeromexico SAB are seeking a $1.5 billion venture to boost flight options for travelers between Mexico and the U.S.

“Passengers will be able to reserve, buy and fly interchangeably between both airlines,” Aeromexico Chief Executive Officer Andres Conesa said in a filing to the Mexican stock exchange. “The potential to combine and align our networks and scheduling will offer our clients a better product than what they’d get individually.”

If approved by U.S. and Mexican regulators, the agreement would also increase shared investments in airport installations such as lounges and boost mutual sales and promotions, Aeromexico said. The venture would deepen a relationship that started with a codeshare agreement in 1994, Delta said in a statement. The two airlines offer more than 4,000 weekly codeshare flights now.

Delta President Ed Bastian disclosed on Dec. 11 that the company had started talking with Aeromexico about a new partnership, at least partly to capitalize on a new air treaty between the U.S. and Mexico. It would be Delta’s fourth such partnership, which give airlines some freedom to set schedules and fares without triggering regulators’ concerns of uncompetitive practices.

Delta has similar deals on transatlantic flights with Air France-KLM and Alitalia SpA, with Virgin Atlantic Airways Ltd. on some U.K.-U.S. routes and with Virgin Australia Holdings Ltd. on Australia and New Zealand routes.

The carriers have already struck accords to share access to each other’s airport lounges and check-in counters and to allow passengers to earn and redeem frequent-flier points.

This article was written by Nacha Cattan and Michael Sasso from Bloomberg and was legally licensed through the NewsCred publisher network.

Photo Credit: An Aero Mexico plane. Aero Icarus / Flickr