Wednesday on the NewsHour, airlines scramble to get back on track after an FAA glitch grounds thousands of flights. Russian mercenaries battle for territory in eastern Ukraine as Western nations promise more weapons to aid the country's defense. Plus, the attack on Brazil's government by a far-right mob raises concerns about how extremism in the U.S. has spread abroad.

WATCH TODAY’S SEGMENTS:
What may have caused computer outage that grounded flights
https://www.youtube.com/watch?v=E-rW1woTzAQ
News Wrap: Rep. Santos refuses to resign amid calls to quit
https://www.youtube.com/watch?v=wldsuWYEcqQ
Russian mercenaries claim territory in eastern Ukraine
https://www.youtube.com/watch?v=X8hh9OtI85I
Brazil attack raises concerns about spread of U.S. extremism
https://www.youtube.com/watch?v=m1kGujVWySM
The political wrangling over state house speakerships
https://www.youtube.com/watch?v=-DSl5MCTk1g
Denver mayor on challenge posed by an influx of migrants
https://www.youtube.com/watch?v=o8kOCF1j9-o
Using heat pumps as greener alternative to fossil fuels
https://www.youtube.com/watch?v=RdzjrVwWz4o

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00:00 - Introduction
02:36 - Grounded
08:53 - News Wrap
14:33 - Russian Invasion
23:21 - Exporting Extremism
30:06 - States of Play
38:32 - Beyond the Border
46:04 - The Costs of Heat