Iran closes its airspace by?

Prediction market on manifold. Resolves to this Polymarket, https://polymarket.com/event/iran-closes-its-airspace-by if date is not on Polymarket I reserve the rights to make the call on its resolution [link preview]

24h Volume: $1,352.794. Liquidity: $1,000. Resolves: 6/1/2026.