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Legend & Status

This page explains the short labels you will commonly see in ALB. The exact columns depend on the active layout, so not every timeline shows every abbreviation all the time.

Arrival state abbreviations

  • UKN: unknown arrival state
  • UNS: unsequenced
  • SQ1: sequenced
  • SQ2: locked
  • FZ1: frozen stage 1
  • FZ2: frozen stage 2
  • DIV: diverting
  • CXL: cancelled

These are the main sequence-progress states ALB uses when deciding whether an aircraft is still part of the active arrival plan.

Hold phase abbreviations

  • HDE: entering hold
  • HD1: in hold with estimated EAT still moving
  • HD2: in hold with EAT locked
  • HDX: exiting hold

If the hold phase column is blank, the aircraft is not currently treated as holding traffic.

Common field labels

  • PLR: planned landing rate
  • Expected LR: demand-limited forecast from canonical future LT PLTs
  • AR: arrival spacing for a via-fix stream, shown as minutes between releases
  • Cp: capacity derived from the current spacing
  • 30': the fixed 30-minute overview column in the stats block
  • TMA: aircraft already in the terminal area
  • OBS: observation or warning slot in the selected layout
  • list-style OBS surfaces can also show a longer informational text such as EST UNST for pre-entry traffic that ALB has not yet admitted to normal sequencing
  • Orange timing: ALB's configured route or STAR-based track-mile timing model used as part of the ELT-ALB or ETA:ALB estimate before terminal live estimates take over

For the current OBS note set and how to resolve the common ones, see OBS Notes.

Peer and status indicators

  • Peers(n): number of currently online ALB peers shown for the active airports
  • EAT or PLT button: which value the compact combi field is currently showing
  • TL* / TL-: timeline shown / hidden
  • STAT* / STAT-: statistics shown / hidden
  • in other toggle-style top-button labels, * means enabled and - means disabled
  • FULL: visible but disabled in the current release; it is a reserved future compute-mode control, not a current operational setting

Expected LR row

In EAT:LT, the legend row directly below PLR can show:

Expected LR: 34 #/h (17/30m, vs PLR -6)

Meaning:

  • 34 #/h is the expected hourly landing rate
  • 17/30m means 17 eligible canonical PLTs within the next 30 minutes
  • vs PLR -6 means the forecast is 6 aircraft per hour below PLR

If ALB is not in EAT:LT, the row shows:

Expected LR: -- (EAT:LT only)

Display rules:

  • the row is informational and read-only
  • a value below PLR is not automatically treated as a warning
  • normal valid values use neutral display coloring
  • unavailable 30-minute percentage values should show as --%
  • no smoothing is applied
  • no trend arrow is applied
  • no automatic PLR adjustment is performed

Screenshot note

Some screenshots in this site come from older ALB versions. The overall structure is still useful, but exact spacing and some labels may differ slightly from the latest build.