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ch-aviation • Dirk Andrei Salcedo

Mongolia’s Chingis Airlines Unity secures aviation operator certificate (AOC)

Mongolia’s Chingis Airlines Unity has secured an aviation operator certificate (AOC). The certification milestone positions the carrier to launch or expand commercial flight operations within Mongolia, subject to subsequent regulatory and operational steps.

2026-04-20T23:49:13.987291-07:00

Associated Press

Nashville near-midair between Southwest 737s prompts attention on ATC separation after evasive action

2026-04-20T13:51:24.220894-07:00

Flying Magazine

Brazil flags unsafe condition on Embraer Legacy 450/500 (EMB 545/550)

2026-04-20T14:01:59.311899-07:00

AINonline

NTSB: Pilot judgment error led Citation III to incur hail damage—incident remained unreported for three months

2026-04-20T11:21:59.046347-07:00

News Timeline

ch-aviation

Mongolia’s Chingis Airlines Unity secures aviation operator certificate (AOC) Mongolia’s Chingis Airlines Unity has secured an aviation operator certificate (AOC). The certification milestone positions the carrier to launch or expand commercial flight operations within Mongolia, subject to subsequent regulatory and operational steps.

2026-04-20T23:49:13.987291-07:00

Mongolia’s Chingis Airlines Unity secures aviation operator certificate (AOC)

Flying Magazine

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Brazil flags unsafe condition on Embraer Legacy 450/500 (EMB 545/550) Brazilian civil aviation authorities have warned of an “unsafe condition” affecting all Embraer EMB 545 Legacy 450 and EMB 550 Legacy 500 business jets. The alert signals a regulatory safety concern that operators and maintenance providers will need to address across the entire fleet.

2026-04-20T14:01:59.311899-07:00

Brazil flags unsafe condition on Embraer Legacy 450/500 (EMB 545/550)

Associated Press

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Nashville near-midair between Southwest 737s prompts attention on ATC separation after evasive action Two Southwest Airlines Boeing 737 aircraft came within about 500 feet over Nashville International Airport (BNA) after controller instructions and a go-around maneuver contributed to an apparent loss of separation. The crews took emergency evasive action to avoid a collision, and the event is under investigation.

2026-04-20T13:51:24.220894-07:00

Nashville near-midair between Southwest 737s prompts attention on ATC separation after evasive action

The War Zone

SNC details “Freedom Trainer” clean-sheet jet for U.S. Navy aviator training, positioning it as a no-compromise cost-saver Sierra Nevada Corporation (SNC) provided details on its clean-sheet Freedom Trainer offering for U.S. Navy aviator training, framing the aircraft as a “no-compromise” solution designed to cut training costs. The update comes as the Navy pursues replacement of legacy undergraduate jet training aircraft via UJTS competition.

2026-04-20T11:36:27.047365-07:00

SNC details “Freedom Trainer” clean-sheet jet for U.S. Navy aviator training, positioning it as a no-compromise cost-saver

AINonline

NTSB: Pilot judgment error led Citation III to incur hail damage—incident remained unreported for three months The NTSB found a pilot judgment error caused a Cessna Citation III hail-damage event over Colorado, with details not coming to light until an anonymous complaint three months later. The finding highlights reporting delays and decision-making lapses in adverse-weather encounters.

2026-04-20T11:21:59.046347-07:00

NTSB: Pilot judgment error led Citation III to incur hail damage—incident remained unreported for three months

DefenseNews.com

US Army Corps of Engineers seeks doctrine for safe helicopter landings on Arctic frozen lakes The US Army Corps of Engineers’ R&D effort is focused on overturning long-standing assumptions about the risks of landing helicopters on frozen lakes. The work aims to expand and formalize military operating options on ice, including enabling safer Black Hawk landings.

2026-04-20T11:07:37.696901-07:00

US Army Corps of Engineers seeks doctrine for safe helicopter landings on Arctic frozen lakes

AeroTime

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Qatar QCAA issues NOTAM as Hamad International Airport begins phased restart for foreign airlines Qatar says Hamad International Airport is resuming foreign airline operations in a carefully phased manner after sustained disruption. The QCAA has issued a NOTAM authorizing returns under global safety standards, with Qatar Airways increasing inbound and outbound activity through Doha as slots and procedures normalize.

2026-04-20T09:11:01.658238-07:00

Qatar QCAA issues NOTAM as Hamad International Airport begins phased restart for foreign airlines

DefenseNews.com

DARPA advancing synthetic, shelf-stable blood to modernize battlefield medical care DARPA is overseeing development of synthetic blood designed to be shelf-stable and deployable for battlefield use. The program focuses on creating a lab-produced blood substitute that could reduce constraints around blood storage and delivery, with the goal of integrating it into troops’ kits on an accelerated timeline.

2026-04-20T08:42:42.434370-07:00

DARPA advancing synthetic, shelf-stable blood to modernize battlefield medical care

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Aviation Safety & Regulation News

Mongolia’s Chingis Airlines Unity secures aviation operator certificate (AOC)

Nashville near-midair between Southwest 737s prompts attention on ATC separation after evasive action

Brazil flags unsafe condition on Embraer Legacy 450/500 (EMB 545/550)

NTSB: Pilot judgment error led Citation III to incur hail damage—incident remained unreported for three months

News Timeline