Two crew killed after firefighting helicopters collide in Greece, as British pilot survives

What we know about two

One Danish and one Greek national died in the incident, while a British pilot and another Greek crew member survived

Why this counts

What makes this worth tracking, according to BBC, is the chain of decisions it may trigger.

What precedes this

The background, as BBC reports, involves shifts that have been visible for some time in two, crew, killed, firefighting, helicopters.

Where this fits in Signal Ledger

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The lens

Signal Ledger reads this through the lens of two, crew, killed, firefighting, helicopters: One Danish and one Greek national died in the incident, while a British pilot and another Greek crew member survived.