The first thing to stop the morning deliveries was a pillowcase. It was white and hanging nine meters above Fish Lane when Courier 44 came around the bend and applied its brakes.
Mara watched the recording twice at the routing office. The courier held its position with a small, offended shiver. Below it, a fish seller pushed a cart through the market without looking up.
The city called the space between third-floor windows and the tram wires the lower air. Once it had been empty enough for washing lines and festival flags. Now cargo machines crossed it all day, bringing medicine, groceries and parts across the canals faster than the narrow bridges allowed.
The couriers had collision sensors. Nothing had fallen. The pillowcase was not a catastrophe. It was, according to Mara's screen, an unauthorized occupation of a licensed flight corridor.
She took the pedestrian ferry to Fish Lane with a measuring pole and a notice printed on yellow paper. She had been there to mark a repaired balcony. She knew the bakery sold its last sesame rolls before nine.
On the third floor, Edra opened the door carrying bed linen. Behind her, three chairs stood near an open window. On each sat a woman folding sheets, their elbows moving in practiced disagreement.
'That line's been there thirty years,' Edra said after reading the notice.
'The route's been here six.'
'Then the machines have had six years to learn where it is.'
Mara disliked how reasonable this sounded. She also disliked a courier dodging wet laundry in a gust, its cargo swinging into somebody's window.
Edra led her onto the balcony. The line was tied to an iron hook across the lane, above an old covered stairway. A burst pipe had soaked the communal laundry room. There was no roof space; solar equipment had been installed last winter.
'We take it down when the clothes are dry,' Edra said. 'We only need the morning.'
Mara checked the schedule. Seventeen couriers were waiting upstream. One carried a box from the north clinic with a cold-chain tag. The rest might contain anything; the network displayed weights and delivery windows, not private parcels' contents.
'I can't leave a line where a courier could meet it,' she said. 'And the clinic box can't sit there all morning.'
Edra looked at a woman in a blue scarf. 'You hear that? We are competing with a box.'
'It might be important,' Mara said.
'So might the washing.'
Nobody argued. The women had carried up sheets for two households with babies, a neighbor recovering from surgery and a night-market worker. Clean linen was not an emergency, but nor was it a hobby to postpone forever.
On the street, Mara opened the rerouting map. She could close the lane and send couriers over the water. The high route had space for six light machines an hour. Heavy loads would use a ground carrier across the west bridge, forty minutes away when the market opened.
Dispatch answered on the third call. 'Clear the obstacle,' her supervisor Moss said. 'The route is approved.'
'Can we make a morning closure permanent?'
'A resident can apply. Twelve weeks' review. They must specify the period and prove they need the space.'
'They use it to dry sheets.'
'Then put that in the form.' He paused. 'An exception gets charged to somebody. If you sign it, it's yours.'
Mara bought a roll she did not want and called the clinic. A nurse named Ivo confirmed its cold-chain box was due within twenty minutes but could tolerate a longer journey in its insulated case. He would not say what was inside. He asked her to call if the temperature alarm sounded.
She could have asked Edra to remove the line. That was within the rules. The women would have carried everything inside, probably without another word. Tomorrow the line would be back.
She went upstairs instead and explained the choices. The high route could take some loads now. Others would arrive late. The laundry could remain for forty-five minutes, but Mara would record a safety closure under her name. She would not promise tomorrow.
'So it's your permission we need,' Edra said.
'Today, yes.'
'And next week?'
'That's what I need to ask you about.'
Edra seemed less angry now, which was worse. 'We weren't asking to own the sky,' she said. 'We were already using it.'
Mara returned to the corner and entered a restriction: FLIGHT CORRIDOR CLOSED, 07:45–08:30, HUMAN OCCUPANCY. The system offered OBSTACLE REMOVAL as the default reason. She deleted it. It asked who accepted operational responsibility. She entered her employee number.
The couriers peeled away toward the canal. Through the bakery window, she watched red navigation lights climb above the bridge. One heavy carrier remained in the holding bay while a ground bike came to collect it.
Moss called again. 'The west bridge queue is already eleven minutes. Cancel the exception?'
'No. Log the delays under my name. I'll stay until the line's down.'
For a while there was only waiting. Edra brought her water. The fish seller moved crates into the shade, and a child leaned from a window to count machines crossing higher up. He reached seven before losing count.
At eight fifteen, Mara called the clinic. The box had arrived without triggering its temperature alarm, later than planned but inside Ivo's margin. Two ordinary parcels were still waiting at the bridge. She added their delays to her report instead of hiding them in the route average.
At eight twenty-eight, the women drew in their linen. The last sheet caught on the iron hook. Mara held the measuring pole beneath it until Edra freed the corner, and the air between the buildings was clear.
The first courier resumed its route at eight thirty-one. Its fans stirred the bakery awning. Upstairs, the women were folding sheets to carry back down the stairs.
Edra called from the balcony. 'Will you come tomorrow?'
Mara looked at the form on her screen. It allowed one exception, not a recurring arrangement. Beneath it was a blank field: REQUEST FOR REVIEW. She entered the address and a time the residents could be home.
'I will,' she said. She stayed to give Edra the reference number before the next courier came through.