Slots, ATC and
Flight Planning
Airport slots and PPR, CTOTs and A-CDM, why a flight plan gets suspended in Europe, IFR routes and data link, night curfews and quota counts, TFRs, oceanic contingencies and the ETOPS question for business jets.
Reviewed by Kevin Singh, Founder · Fact-checked against Icarus Jet fleet and airport operations data · Last updated 11 September 2026
The working reference
How slots and ATC work for a private flight
A private flight needs three separate clearances that are easy to confuse: the airport slot or PPR that lets it use the runway and the stand, the ATC flight plan that lets it fly the route, and in Europe the calculated take-off time that the Network Manager assigns when a sector is regulated. Slots are mandatory at the coordinated airports, Luton, London City, Northolt, Stansted, Gatwick, Heathrow, Nice, Ibiza, Mykonos and Sydney among them, and at A-CDM airports the slot, the target off-block time and the CTOT are linked, so a late passenger costs the departure its place in the sequence. A European flight plan is suspended when the aircraft does not report ready within the tolerance window, and reactivating it takes a new message and often a new CTOT. Night curfews and quota counts limit London, Sydney and Adelaide; Luton allows ten night slots. Flight plans are filed at least six hours ahead in Morocco and with a copy to the ARO for Cuba. On the North Atlantic, the contingency procedure is a 30-degree turn to a 5 NM offset with lights on and a broadcast on 121.5, and a weather deviation is requested in the exact phraseology or by CPDLC. No business jet is ETOPS certified, so Part 135 operators stay within 180 minutes single-engine cruise of a diversion field, which is what draws the oceanic routings. The desk books the slot with the handler, files the plan, watches the CTOT and reroutes when a regulation lands.
Slots and PPR
A slot is a time window to use a coordinated airport; PPR is the airport's prior permission for an uncoordinated field. Luton, London City, Northolt, Stansted, Gatwick and Heathrow are slotted; Farnborough and Biggin Hill run on PPR. Nice, Ibiza, Palma, Mykonos and Sydney are slotted in season or all year. The China permit carries its own slot window.
CTOT and A-CDM
When a European sector or airport is regulated, the Network Manager assigns a calculated take-off time, and the aircraft must be airborne within its window. At A-CDM airports the target off-block time feeds the sequence, so the desk keeps the passengers, the fuel and the handler aligned to one time. Summer slot constraints in France, Greece and Spain are the worst of the year.
Flight plan suspension
In Europe a flight plan is suspended when the aircraft misses its ready window, usually because passengers are late, and the message has to be reactivated before ATC will clear the departure, often with a new CTOT behind it. The fix is to amend the estimated off-block time as soon as a delay is known, not after the window has closed.
Night restrictions and TFRs
Heathrow, Gatwick and Stansted keep night movement caps and quota counts through 2028; Luton allows ten night slots between 2200 and 0600; Farnborough, Biggin Hill, Oxford and London City close overnight; Sydney and Adelaide close 2300 to 0600. In the United States a presidential TFR, Mar-a-Lago among them, closes the inner ring and gates the outer one on a TSA screening.
IFR routes and data link
The FAA publishes preferred IFR routes by city pair and the Chart Supplement lists them with the SIDs, STARs and constraints; user-preferred routes still need ATC approval. European airspace above FL285 requires CPDLC data link with exemptions that are narrowing, and US crews without it are routed below. The desk files the route the system will accept.
Oceanic and ETOPS
NAT contingency: turn at least 30 degrees to a 5 NM offset, lights on, squawk 7700 as appropriate, broadcast on 121.5 or 123.45, then descend below FL290 or offset 500 feet. Weather deviation by the phraseology or CPDLC downlink. No business jet is ETOPS certified; Part 135 stays within 180 minutes single-engine of a diversion field, which is why the Atlantic runs through Gander, Keflavik and Shannon and the Pacific through Adak, Hilo and Nadi.
Where it applies
How the rule changes by region
United Kingdom
Slots at six of the London fields, PPR at Farnborough and Biggin Hill, night caps and quota counts through 2028, ten night slots at Luton. The airport pages carry the detail.
Europe
CTOTs and A-CDM sequencing, summer slot constraints at the resort airports, flight plan suspension when the ready window is missed, CPDLC required above FL285.
Middle East and the routings
Slot approvals inside the permit window in the Gulf, the Miami to Dubai tech stop planned on the airspace picture, Baghdad above FL320.
United States
No slots at most business aviation fields but TFRs, the busiest executive airports on their own pages, and the reservation systems at the slot-controlled majors.
Asia and Australia
Chinese slots must sit inside the permit's validity; Beijing Capital moves slots for government events. Sydney slots mandatory with the 2300 to 0600 curfew; Melbourne has no slots.
The oceans
North Atlantic contingencies and weather deviation on the special procedures; Pacific routings drawn by the 180-minute diversion arcs; South China Sea weather deviations from June to October.
Guides and updates
Slots and ATC articles from the desk
The detailed pieces behind this page, newest first, each with the year it was written and the discipline it belongs to.
A Flight Plan Is a Conversation: What the Dispatcher Sees vs What the Captain Sees
What dispatch and the captain each see on the same flight plan, and the exchange between them.
Read the guide2026Slots and ATCCTOTs in Europe: What Private Jet Pilots Need to Know
What a Eurocontrol CTOT is, why refiling makes it worse, and how the desk manages summer delays.
Read the guide2026Safety and riskETOPS, private jets, and the "Time in Jeopardy" myth
Debunks the idea that private jets are ETOPS certified and explains the 180-minute 'time in jeopardy' diversion rule, its AFM-based calculation and how it shapes Atlantic and Pacific routings.
Read the guide2023Slots, ATC and flight planningIFR Routes - What Are They & Where to Find Them
Explainer on IFR routes, preferred routes, where to find them (FAA, ForeFlight, FSS), how to file and fly them, the Chart Supplement, fix-to-fix routes and User Preferred Routes.
Read the guide2019Slots, ATC and flight planningTrip - Support - NAT OPS - contingency - weather deviation Special Procedures
Walks through the NAT contingency, weather-deviation and lost-navigation procedures introduced in March 2019 for Shanwick, Gander and Santa Maria.
Read the guideCountry guides
Where the rule differs by country
The regional pages that carry the detail for this discipline, each with the permit, entry, slot, handling and fuel facts for that country.
Questions
Slots and ATC trip support questions
What is the difference between a slot and PPR?
A slot is an allocated time window at a coordinated airport, issued by the coordinator and mandatory. PPR is prior permission from an uncoordinated airport, granted by the operator of the field. The London fields split both ways, so the desk checks each one.
What is a CTOT?
The calculated take-off time the European Network Manager assigns when a sector or airport is regulated. The aircraft must be airborne within its window, and a missed window means a new CTOT further back in the sequence.
Why was my flight plan suspended?
Because the aircraft did not report ready within the tolerance window around its estimated off-block time, usually due to late passengers. The plan is reactivated by message, often with a new CTOT. Amending the time as soon as a delay is known prevents it.
Can a private jet land in London at night?
At Stansted and Gatwick within their quota counts, at Heathrow within its cap, and at Luton in one of ten night slots. Farnborough, Biggin Hill, Oxford and London City are closed overnight.
Do I need data link to fly in Europe?
Above FL285, yes, with exemptions that are narrowing. Aircraft without CPDLC are routed below, which costs fuel and time on a transatlantic arrival. The desk files the route the system will accept for the equipment on board.
Are business jets ETOPS certified?
No. Part 135 operators stay within 180 minutes single-engine cruise of a suitable diversion airport, beyond which formal ETOPS approval would be required, and that constraint draws the North Atlantic and Pacific routings.
What is the NAT contingency procedure?
Turn at least 30 degrees to establish a 5 NM parallel offset, exterior lights on, squawk 7700 as appropriate, broadcast on 121.5 or 123.45, then descend below FL290 or apply a 500 foot vertical offset. A weather deviation is requested in the exact phraseology or by CPDLC downlink.
Where do I find preferred IFR routes?
The FAA publishes them by city pair in the Chart Supplement with the SIDs, STARs and altitude and speed constraints, and the flight planning apps carry them. User-preferred routes still need ATC approval.
What does a presidential TFR mean for a private flight?
An inner ring closed to general aviation and an outer ring open only to flights that meet the gateway and screening conditions. Mar-a-Lago has its own guide with the rings and the procedure.
What does the desk need to book slots and file the plan?
The aircraft and its equipment, the airports, the times with a realistic off-block estimate, the passengers' likely arrival at the aircraft and the alternates. It comes back with the slots or PPRs booked, the plan filed, the CTOT watched and the routing checked against the airspace picture.
Get it filed
Slots booked and plans filed from the desk
Send the schedule and the aircraft, and the desk books the slot or PPR, files the flight plan, watches the CTOT and keeps the departure in sequence when the passengers run late.
Contact UsPrefer to talk? Call +1 888 277 7203 or email tripsupport@icarusjet.com. The desk is staffed 24/7.