Fit to fly: what should be checked?

“Fit to fly” means that the traveller can complete the planned air journey medically and practically without unreasonable risk to themselves, other passengers or the crew. Required assistance, medical equipment, oxygen, a companion and documents must be organised in time.

This is not only about the flight itself. A realistic assessment includes:

• home to departure airport
• airport check-in and security
• boarding and seating
• cabin pressure, oxygen and long sitting time
• toileting, eating, drinking and medication during travel
• layovers and assisted transfers
• arrival airport, baggage and mobility equipment
• transfer to the accommodation
• first 24–72 hours after arrival

Anyone with relevant health uncertainty should check before booking. This is especially important when a traveller has a recent illness, recent surgery, unstable symptoms, oxygen needs, medical devices, mobility limitations, cognitive issues, significant medication needs or a history of complications during travel.

A check may be especially important for people with:

• heart or circulation conditions
• lung disease, low oxygen levels or breathing problems
• recent surgery, injury, hospitalisation or infection
• recent stroke, seizure, fainting or neurological symptoms
• history of deep vein thrombosis or pulmonary embolism
• blood disorders or severe anaemia
• diabetes or complex medication routines
• pregnancy or recent birth
• cognitive impairment, confusion, dementia or high anxiety
• need for CPAP, oxygen, ventilator, dialysis or other medical equipment
• need for personal care, nursing care or a companion during travel
• unstable mental-health symptoms or crisis risk

A doctor letter can help explain the traveller’s condition, medication, equipment needs and fitness to travel. It does not automatically guarantee airline approval, but it can support airline medical clearance where needed.

A useful letter may include:

• traveller name and date of birth
• diagnosis or relevant medical background where necessary
• current stability of the condition
• medication list with active ingredients and doses
• allergies and major risks
• medical equipment needed during travel
• whether oxygen, CPAP, POC, wheelchair or stretcher support is needed
• whether the traveller can sit upright for take-off, landing and turbulence
• whether the traveller can manage toileting, eating and medication during flight
• whether a companion or medical escort is needed
• doctor contact details, signature and date

Airline medical clearance may be needed when the airline needs to check whether the passenger can safely fly and what support or equipment is required. Airlines often use a Medical Information Form, sometimes called MEDIF.

Clearance may be needed when:

• fitness to travel is uncertain
• the condition is unstable or recently worsened
• there has been recent surgery, injury, hospitalisation or serious illness
• the traveller needs oxygen, stretcher, incubator or medical escort
• medical equipment is needed during the flight
• the traveller may deteriorate during flight
• the condition may be affected by cabin pressure or cabin environment
• the traveller cannot care for themselves independently during the journey
• there may be an infectious disease concern

Oxygen, CPAP, portable oxygen concentrators, ventilators, batteries and other medical devices must be checked with the operating airline before travel. Rules can differ between airlines, aircraft, routes and device types.

Check:

• whether the device is allowed on board
• whether it can be used during flight
• whether medical clearance is required
• whether battery capacity must cover the flight plus delays
• whether device make, model, weight and dimensions must be submitted
• whether oxygen is provided by the airline or must be arranged separately
• whether oxygen is available only in flight and not on the ground
• whether layover, arrival and ground-transfer oxygen needs are covered
• whether chargers, adapters and backup plans are ready

No. Airport assistance can help a passenger move through the airport, board, transfer between gates or reach baggage claim. It does not automatically mean that the person is medically fit to fly, safe to travel alone or able to manage personal care during the journey.

Check separately:

• whether wheelchair assistance is needed to the gate, aircraft door or seat
• whether the traveller can use stairs
• whether an aisle chair is needed
• whether the traveller can sit upright and use the aircraft seat belt
• whether toileting during the flight is possible
• whether the traveller needs a companion
• whether mobility equipment and batteries are accepted
• whether connection times are realistic with assistance

A companion may be needed when the traveller cannot safely complete the journey alone. The reason may be practical, safety-related, communicative or medical.

A companion may be needed if the traveller cannot:

• understand and follow safety instructions
• evacuate with enough independence to meet the airline’s safety requirements
• manage medication, food, hydration or toileting during travel
• communicate needs under stress
• manage transfers between a wheelchair, seat and toilet
• respond safely if symptoms change
• manage cognitive impairment, confusion, anxiety or panic
• protect themselves during long layovers or disruption

Depending on the need, a non-medical companion may be sufficient. In other cases, a qualified nurse, paramedic or doctor may be required. Whether this support is medically necessary and accepted for the selected route must be decided by the treating doctor together with the operating airline.

Recent illness, surgery, injury or hospitalisation should be checked before flying. The issue is not only whether the person feels “well enough,” but whether cabin pressure, oxygen levels, immobility, pain, bleeding risk, infection risk, wounds, drains, casts, swelling, medication and travel stress are safe.

Ask a doctor and airline where relevant after:

• recent surgery
• recent hospital discharge
• recent heart event or procedure
• recent stroke, seizure or loss of consciousness
• recent deep vein thrombosis or pulmonary embolism
• recent pneumothorax or lung issue
• recent major injury or fracture
• new cast or immobilised limb
• recent infection or fever
• new medication or unstable symptoms

Long flights and long travel days can involve many hours of sitting. This can matter for travellers with previous deep vein thrombosis, pulmonary embolism, recent surgery, reduced mobility, pregnancy, cancer, certain medication or other risk factors.

Questions to ask a healthcare professional include:

• Is my clot risk increased by this journey?
• Do I need medical advice about movement, hydration or compression stockings?
• Do I need medication advice before travel?
• Is my condition stable enough for long-haul travel?
• Should the route be changed to reduce travel strain?
• Do I need assistance to move safely during the journey?

Pregnant travellers should check airline rules, medical advice and travel insurance before flying. Rules can depend on weeks of pregnancy, single or multiple pregnancy, complications, route length and airline policy.

Questions to check include:

• Does the airline require a doctor or midwife letter?
• Does the airline have a cut-off week for travel?
• Does the route include long-haul travel, layovers or remote onward transfer?
• Are there any complications or risk factors?
• Is medical care available at the destination if symptoms occur?
• Does travel insurance cover pregnancy-related issues abroad?

Air travel can be stressful even when physically manageable. Crowds, security, noise, sleep disruption, long waits, unfamiliar instructions, language barriers and travel delays can be difficult for people with anxiety, panic attacks, dementia, cognitive impairment, autism, trauma history or unstable mental-health symptoms.

Planning questions include:

• Can the traveller understand safety instructions?
• Can the traveller manage disruption or delays?
• Is a companion needed?
• Is medication timing stable?
• Are airport assistance or quiet routes available?
• Is there risk of confusion, wandering, panic or crisis?
• Can the traveller communicate needs if overwhelmed?
• Is the destination support plan realistic after arrival?

A traveller with a current contagious illness should not fly while there is a realistic risk of infecting other passengers or crew. This is especially important with fever, a confirmed or suspected transmissible infection, a severe cough with suspected infection, persistent vomiting or diarrhoea, or other symptoms that may endanger others. The treating doctor and the operating airline must confirm when travel is appropriate again.

A non-contagious acute illness may also make flying unsuitable when symptoms are unstable, worsening or cannot be managed safely throughout the full route.

Before travelling with acute symptoms, the doctor and operating airline should clarify:

• whether a contagious illness has been safely excluded
• whether symptoms are stable enough for check-in, the flight, transfers and onward travel
• whether postponement is medically recommended
• whether the airline requires a certificate, MEDIF or its own medical clearance
• whether oxygen, medication, equipment or a companion is required
• whether insurance covers cancellation, curtailment or rebooking
• whether suitable medical care is accessible at the destination

Flying may need to be postponed, changed or replaced with medical transport when the route is not realistic for the traveller’s health, mobility, oxygen needs, care needs or safety.

Red flags include:

• doctor has not cleared travel despite relevant risk
• airline medical clearance is required but not approved
• symptoms are unstable, worsening or unexplained
• oxygen or medical equipment rules are not confirmed
• the traveller cannot sit upright when required
• toileting, medication or feeding needs cannot be managed during flight
• airport assistance is needed but not confirmed
• the traveller needs a companion but is travelling alone
• recent illness, surgery, clot, seizure, stroke or infection has not been reviewed
• arrival support, emergency access or insurance is unclear