#scheduling

A map of city dots joined by faint dashed candidate routes, with one route drawn bright and an aircraft on it, on an Active Flights blog card.

Aviation27 Oct 20266 min read

How Airlines Decide Which Routes to Fly

How airlines decide which routes to fly: demand, rivals, the right aircraft, airport slots, hub connections, seasons, and whether the route makes money.

High-frequency short-hop eVTOL rotations packed densely across a day next to sparser conventional flights, on an Active Flights blog card.

Aviation1 Jul 20263 min read

Advanced Air Mobility is coming to the schedule

eVTOL aircraft are moving from concept to the airshow flight line. When electric air taxis start operating at scale, they'll bring a scheduling problem that looks familiar — just faster, denser, and newer.

Individual flight legs linking into a single connected aircraft rotation across a day, with a turnaround gap highlighted, on an Active Flights blog card.

SSIM & Schedules9 Jun 20262 min read

Rotations and tails: how a schedule becomes an aircraft's day

A schedule is a list of flights; an operation is a set of aircraft each flying a connected sequence. Turning one into the other — building rotations and checking they're physically possible — is where the schedule meets reality.

Active Flights illustration of a rocket launch manifest and countdown clock, on an Active Flights blog card.

Space28 May 20264 min read

Do Rockets Have Schedules? Inside a Launch Manifest

A launch date is really a target. Here is how launch windows, range congestion, and scrubs shape when a rocket actually flies.

A star-shaped hub-and-spoke network beside a meshed point-to-point network, rendered as route graphs, on an Active Flights blog card.

SSIM & Schedules11 May 20265 min read

Hub or point-to-point? What the schedule tells you

A carrier's network philosophy is written into its schedule — in the banks at its airports, the degree of its stations, and the shape of its route graph. Here's how to read it.

A grid of origin rows against destination columns with cells shaded by density into a route heatmap, on an Active Flights blog card.

SSIM & Schedules30 Apr 20266 min read

The OD matrix, explained

An origin–destination matrix turns a wall of flight legs into a picture of where a network flows. Here's how to read one built from a schedule — and, just as importantly, what it can and can't tell you.

A capacity bar built from seats multiplied by frequency, next to a faded, unavailable distance axis, on an Active Flights blog card.

SSIM & Schedules16 Apr 20265 min read

Reading capacity without distances: the ASM proxy

SSIM carries seats and times but no stage lengths, so you can't compute true available seat-miles from the file alone. Here's what you can honestly measure — and where the proxy ends.

Active Flights night-flight timeline, on an Active Flights blog card.

Aviation9 Apr 20264 min read

Why Red-Eye Flights Exist (It's Not to Torture You)

Overnight flights feel like a punishment, but they're a finely tuned piece of airline economics. Here's the real reason your plane leaves at 11pm.

An aircraft rotation timeline with two overlapping flight legs highlighted as a conflict, on an Active Flights blog card.

SSIM & Schedules8 Apr 20263 min read

Deconfliction: catching overlapping flights before they bite

A schedule can look perfect and still be impossible — an aircraft in two places at once, a turnaround that can't be made. Deconfliction is finding those conflicts at the desk instead of at the gate.

Two airports joined by a curved great-circle arc over a globe, with a wrong straight chord shown dashed, on an Active Flights blog card.

SSIM & Schedules19 Mar 20265 min read

Great-circle distance and the route map

SSIM names the city pair but not where the airports are or how far apart they sit. To map a network or estimate a stage length you bring your own geography and compute the great-circle distance.

Grouped summer and winter capacity bars across the months of a year, showing the seasonal shape of an airline schedule, on an Active Flights blog card.

SSIM & Schedules17 Mar 20264 min read

Summer vs winter: how airlines rebuild the schedule twice a year

Airlines don't run one schedule — they run two, rebuilt every season. Here's why the summer and winter schedules differ, how the seasons are defined, and why 'what changed' is the question that never goes away.

A pipeline of airline planning stages from network planning through publication to day of operations, on an Active Flights blog card.

SSIM & Schedules24 Feb 20264 min read

The airline planning cycle, end to end

How a flight goes from a line on a network plan to an aircraft at a gate — network planning, scheduling, fleet assignment, slots, publication, and day-of-ops — and where schedule data ties it all together.

A time-of-day slot strip with allocated and constrained slots beside a Level 3 coordinated-airport badge, on an Active Flights blog card.

SSIM & Schedules10 Feb 20264 min read

Airport slots and the schedule: a plain guide to coordination (WASG basics)

At the world's busiest airports you can't just publish a flight — you need a slot. Here's how slot coordination works, the three airport levels, and why the schedule and the slot book have to agree.

A connection timeline showing an inbound flight, a connection gap measured against the minimum connect time, and an outbound flight, on an Active Flights blog card.

SSIM & Schedules13 Jan 20264 min read

Minimum Connect Time (MCT): the hardest number in scheduling

MCT decides whether a connection is sellable — and it's conditional, per-airport, and lives outside the schedule file. Here's why this one number is so easy to get wrong, and what it takes to get it right.

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