One solution is to build a facade of rooftops (which you could use later in the show anyhow), and behind the facade have a ramp which she would either be pulled up to fly away or allowed to slowly to descend the ramp to simulate flying in for a landing.
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Jeffrey Hudkins
Falling Waters WV
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Original Message:
Sent: 04-11-2018 08:55
From: Robert Putka
Subject: Mary Poppins Flying Substitutions
Any ideas from anyone out there that were unable to fly Mary and Bert.... What did you do?