By Andy Pasztor and Robert Wall 

Canadian and European aviation authorities are looking to impose the most-stringent navigation and position-reporting standards ever on jetliners, including many flying long overwater routes, according to industry and government officials.

Some proposals are prompted by the still-unsolved 2014 disappearance of Malaysia Flight 370, while others aim to provide air routes that are more flexible--and entail closer spacing between commercial aircraft--as they cross the Atlantic, these officials said.

No final decisions have been made, and some concepts are likely to take months to resolve. But satellite operators such as Inmarsat PLC and Iridium Communications Inc., along with service providers SITA and the Arinc unit of Rockwell Collins Corp., are maneuvering to pick up business as a result of the prospective changes.

If the proposals pan out, they would revamp busy air corridors in the northern Atlantic and rewrite some long-standing procedures air-traffic controllers have relied on to keep track of aircraft in other parts of the world. Specifics, however, would depend on the capabilities of onboard systems.

The moves also come as new details emerge about the source of earlier airline opposition to less-stringent voluntary tracking standards.

Possible changes being discussed by European Union policy makers could require planes to automatically report their position as frequently as every three minutes outside ground-based radar coverage, these officials said.

That compares with 15-minute tracking intervals proposed by the International Civil Aviation Organization, the air-safety arm of the United Nations, and minimum 10-minute intervals used for certain planes by U.S. air-controllers over portions of the Atlantic they oversee.

A European safety official said deliberations are ongoing, the situation is "blurry," and the timing of any decision is uncertain. The European Commission, the block's executive arm, has said it is "committed to take action quickly on the basis of the results" of interaction with ICAO.

At least one satellite operator, however, has been asked by EU officials to provide technical and cost data related to a potential three-minute standard, according to one industry official. The EU wouldn't comment on internal deliberations.

A global 15-minute standard for routine flight initially was proposed by a task force headed by the International Air Transport Association, the industry's leading trade group. But late last year, IATA reversed course, dropped swift implementation plans and said some member airlines opposed the proposed one-year phase-in period as too onerous.

Now it turns out the opposition was led by British Airways PLC, according to three people involved in the discussions. One person said some of the carrier's older Boeing 767 jets would have had difficulty complying with the proposed standard.

British Airways declined to comment on its stance during last year's deliberations. In a statement, the London-based carrier said "we comply fully with current requirements and will meet the revised requirements using equipment already installed on our fleet." The company promised to work on development and implementation of new requirements.

In February, IATA and ICAO agreed to work together on demonstration efforts for the proposed 15-minute standard.

As part of a different initiative, British and Canadian air-traffic control officials are planning demonstration flights later this year across portions of the North Atlantic they supervise that would slash the minimum lateral separation between certain planes.

During those validation flights, planes would be permitted to come as close as 25 nautical miles to each other--of within half a degree of latitude--versus current minimum spacing of double that distance, according to Ron Singer, a spokesman for Nav Canada, which owns and operates the country's civil navigation network.

The goal is to shorten flight times, take better advantage of favorable winds and reduce fuel burn.

At the same time, airliners flying the Atlantic that are equipped with some of the most modern electronics this year began using data links in some airspace that enables position reports every 14 minutes, compared with the current 18-minute standard that Canada, Britain and partners rely on, said Andy Smith, head of operational strategy for Britain's air-traffic services provider NATS.

The computer link will allow controllers to more closely space aircraft, he said, giving airlines greater operational flexibility. The link also can alert controllers when airlines deviate from their approved course.

The upgrade will particularly benefit airlines that are flying some of the most advanced models with sophisticated satellite systems, such as Boeing Co. 787 Dreamliners and Airbus A380 superjumbos. Eventually, airlines that refuse to upgrade will be shut out from some of the most attractive flight paths between Europe and North America.

With an estimated 11,000 jetliners around the globe equipped with satellite-communication and related systems capable of meeting proposed 15-minute tracking requirements, other regions are planning their own test flights. In portions of Asian airspace, the Federal Aviation Administration already sets 14-minute reporting intervals for the best-equipped planes.

Write to Andy Pasztor at andy.pasztor@wsj.com and Robert Wall at robert.wall@wsj.com

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