Thousands of Airbus planes are back in the sky after a brief grounding over safety concerns. The issue started when solar radiation was found to affect the planes' onboard computers. About 6,000 Airbus A320 family planes, including A318, A319, and A321 models, needed fixes. Most planes got a quick software update. Around 900 older models require new computers and remain grounded until replacements arrive. French Transport Minister Philippe Tabarot said on Saturday that updates went "very smoothly" for over 5,000 planes. Fewer than 100 still awaited updates. Airbus CEO Guillaume Faury apologized for "logistical challenges and delays," assuring that teams are working "as swiftly as possible." Several Air France flights at Paris's Charles de Gaulle Airport faced delays or cancellations. American Airlines expected "operational delays" but expected most updates done by Saturday. Delta Airlines predicted a limited impact. The UK Civil Aviation Authority reported airlines worked overnight to apply updates, with no serious disruption to air traffic. Gatwick Airport saw "some disruption," but Heathrow had no cancellations. Manchester and Luton Airports expected no major problems. British Airways and Air India were mostly unaffected. Easyjet completed updates on many planes and planned to operate normally. Wizz Air also ran normal flights after overnight updates. In Australia, Jetstar canceled 90 flights but has updated most aircraft, with some weekend disruptions expected. Air New Zealand grounded its A320 jets but resumed all flights after updates. The problem came to light after a JetBlue flight between the US and Mexico suddenly lost altitude in October, causing an emergency landing and injuring 15 people. Airbus found that at high altitudes, strong solar radiation could disrupt the flight elevation software. Older planes needing new computers stay grounded until replacements arrive, with timing depending on parts availability.