Aircraft redelivery timeline: a T-minus plan from 24 months out to handback

What T-minus planning means

T-0 is the return date set by the lease, or the date agreed with the lessor if it has moved. Every milestone is expressed relative to it: T-365 is one year before the return and T+30 is one month after. When the return date changes, every milestone moves with it and the plan stays consistent.

Relative dates also make the plan reusable. A timeline built for one return becomes the starting point for the next, adjusted to the lease, the aircraft's maintenance status and the work scope.

The timeline at a glance

The windows below reflect common practice for a narrowbody aircraft on an operating lease. Widebody aircraft, heavy maintenance falling due near the end of the lease or a records library with known gaps usually justify starting earlier.

How early to start

Industry guidance commonly places the start of redelivery planning 18 to 24 months before the return date, with the detailed work concentrated in the final 12 months. A late start rarely saves effort; it removes options. A shop visit that could have been scheduled at the right moment, or a records gap that could have been closed with a previous operator, turns into a compensation discussion instead.

Start at the earlier end of the range, or before it, when:

• An engine, APU or landing gear shop visit may fall due in the last two years of the lease.
• The return conditions call for heavy maintenance, such as an airframe check or structural inspections, shortly before the return.
• The aircraft has had several previous operators, or its records library is known to have gaps.
• The aircraft will leave its current register, which adds deregistration and export steps.
• Several aircraft return in the same period and compete for the same people, MRO slots and spare engines.

T-24 to T-18 months: decide and mobilise

The first decisions are as much commercial as technical. Confirm whether the aircraft will be returned, extended or purchased, and respect the notice periods the lease sets for that decision.

• Confirm the return, extension or purchase decision internally and with the lessor.
• Appoint a transition manager with the authority to coordinate technical, commercial and finance teams.
• Assemble the lease file: the lease, every amendment and side letter, the delivery acceptance certificate and the delivery documents. Discrepancies accepted at delivery can affect what must be delivered at return.
• Forecast the aircraft's maintenance status at T-0 from planned utilisation: airframe checks, engine and APU shop visits, landing gear overhaul and the remaining life of life-limited parts.
• Identify the decisions with the longest lead times, such as engine shop visits, landing gear overhaul or exchange, repaint and cabin reconfiguration.

T-18 to T-12 months: analyse and plan

This phase turns the lease into a plan. The return conditions become a requirement matrix, and the forecast status at return is compared with each condition.

• Build the requirement matrix: one line per obligation, with its lease clause, owner, due date and expected evidence.
• Run a gap analysis between the forecast status at return and each return condition.
• For each gap, compare the options the lease allows: perform the work, pay compensation where the lease provides for it, or agree an alternative with the lessor.
• Define the shop visit strategy for engines, APU and landing gear, and secure the slots or exchange units it depends on.
• Prepare the redelivery budget and a first estimate of financial exposure, taking into account the lease's maintenance reserve and compensation mechanisms.
• Plan the records audit: scope, team, order of review and the format the lessor expects.

T-12 to T-9 months: audit and engage

The records audit is usually the longest task in a lease return, so it should start well before the physical work. A gap found now can often still be closed with documents; the same gap found at the final inspection may only be resolved by replacing the part or paying compensation.

• Start the records audit: AD and SB status, life-limited part traceability, hard-time components, repairs and the damage chart, modifications and maintenance programme compliance.
• Log every records gap as a finding with an owner, a due date and the evidence that will close it.
• Request missing documents from previous operators, repair shops and part suppliers as soon as each gap is found.
• Book the MRO slot for the redelivery check and draft the work scope against the return conditions.
• Write a plain-language interpretation of the return conditions and raise open interpretation questions with the lessor early.

T-9 to T-6 months: agree the plan with the lessor

Many leases call for a pre-redelivery meeting in this window. Its purpose is to remove surprises: both parties should leave with the same understanding of the return conditions, the schedule and the evidence the lessor expects.

• Share the MRO, the work scope and the schedule of any engine, APU or landing gear shop visits.
• Agree the inspection plan: the lessor's representatives, the location, the dates and what they will witness.
• Agree the records format, the delivery schedule and how records comments will be raised and answered.
• Record every interpretation agreed with the lessor in writing, against the requirement it concerns.
• Perform engine and APU borescope inspections early enough to act on the results.
• Order long-lead parts, modification kits and paint materials.
• Confirm the deregistration and export requirements if the aircraft will leave its current register.

T-6 to T-3 months: prepare the aircraft and records

• Close the remaining records gaps, or agree with the lessor how each one will be resolved.
• Issue the status reports the lease requires, such as AD and SB status, LLP status sheets and the hard-time component listing.
• Reconcile flight hours and cycles across the maintenance system, the logbooks and the status reports.
• Carry out a physical pre-inspection to find defects, corrosion and damage before the lessor does.
• Plan the removal of operator-specific modifications and equipment, the repaint and the cabin configuration the lease requires.
• Deliver the records package in the agreed format, early enough to answer the lessor's comments before the joint inspection.
• Update the exposure estimate as findings are raised and closed.

T-3 months to T-0: execute and accept

The final phase is driven by the redelivery check and the joint inspection. Daily coordination between the MRO, the records team and the lessor's representatives decides whether the aircraft leaves on time.

• Perform the redelivery check and rectify the defects it reveals.
• Hold the joint inspection with the lessor's representatives, including the borescope inspections and engine runs the lease requires.
• Triage new findings every day: rectify, provide evidence, defer by agreement or compensate.
• Perform the demonstration flight if the lease includes one.
• Agree the remaining open items and how each will be treated, and record the agreement.
• Prepare the deregistration and export documents and the final records package.
• Sign the acceptance documentation and hand the aircraft back at the return location.

After T-0: close out

• Complete the open items agreed at acceptance within the agreed time.
• Settle compensation, maintenance reserve claims and any security deposit or letter of credit as the lease provides.
• Retain the accepted records package and the history of the lessor's decisions.
• Hold a lessons-learned review and update the timeline before the next return.

Where timelines usually slip

Industry surveys of lessors and lessees regularly cite underestimated effort, unscheduled repairs and failed borescope inspections among the main causes of late returns. In practice, delays tend to come from the same places:

• Engine shop visit slots and exchange units that were not secured early enough.
• Records gaps from previous operators that take weeks or months to resolve.
• Unscheduled repairs found during the redelivery check.
• Late engagement with the lessor, so that interpretation questions surface at the final inspection.
• No time planned for the lessor to review evidence, or for the team to answer comments.
• Long-lead parts, modification kits or paint slots ordered too late.

Build your own T-minus plan

• Set T-0 to the contractual return date and update it as soon as a new date is agreed.
• Express every milestone as an offset from T-0 rather than as a calendar date.
• Give each milestone an owner team and a short basis: the lease clause, the lead time or the decision it supports.
• Link requirements and tasks to the milestone they must meet, so that a slipping milestone shows the work it puts at risk.
• Review the timeline at least monthly, and weekly during the final six months.

Start from the free template

The template below contains 28 example milestones from T-730 to T+60, each with a code, an owner team and the reason for its timing. Its columns match Redelvia's milestone import, so you can adapt it in Excel or Google Sheets and import it later. The offsets are examples: adjust every line to your lease, your aircraft and your work scope.