PARIS (Reuters) - Airbus is pulling out the stops to try and take the lead in its annual order contest with Boeing, lining up a spree of multi-billion-dollar deals to close a traumatic year haunted by management upheaval and corruption investigations.

FILE PHOTO: An Airbus logo is pictured during the delivery of the new Airbus A380 aircraft to Singapore Airlines at the French headquarters of aircraft company Airbus in Colomiers near Toulouse, France, December 13, 2017. REUTERS/Regis Duvignau

Deals announced this week include confirmation of a record 430-jet order brokered by U.S.-based private equity firm Indigo Partners on behalf of four airlines. But some analysts said Airbus may have to offer large discounts to close the gap.

The Indigo deal and up to 275 other last-minute orders are seen as a grand finale for Airbus sales chief John Leahy, who is due to retire in January after roughly trebling Airbus’s market share in his 23 years at the helm.

Airbus has endured what insiders describe as a painful year, falling sharply behind Boeing and seeing its sales teams demoralized by the impact of UK and French probes into the use of middlemen by a now-disbanded headquarters unit.

Its share price is nonetheless near record highs as the planemaker recovers from recent production problems.

Looking to retire on a high, Leahy is seen keen to sell at least as many aircraft as the 700 jets Airbus expects to deliver in 2017 - after revising the internal target up from 400 earlier this year when the industry was slowing sharply.

But many observers expect the New Yorker to go further and try to match Boeing, which reported 844 net orders up to Dec. 19 and is believed to be closer to the 900 mark now.

Airbus has announced deals for a total of 705 narrowbody jets since the end of November, including over 500 in 24 hours - an industry record, according to Jefferies analyst Sandy Morris, who did not rule out Airbus eventually raising narrowbody output towards 70 jets a month from record output plans of 60.

The latest orders lift Airbus’s potential catch for the year above 1,000 before adjusting for cancellations.

Deals also include 100 jets to Delta Air Lines, 50 each to lessors AerCap and China Aircraft Leasing (CALC) and 75 spread between two other airlines.

ORDER DASH

Whether Airbus completes a surprise comeback depends on how many of the latest orders are net additions to the order book.

Hungary’s Wizz Air said its share of the Indigo order, comprising 146 jets, needed shareholder approval.

If all deals announced by Airbus since the start of December are included in the end-year total, then two thirds of the year’s business will have been done in the final month, compared with an average of 20 percent in the previous 10 years.

Some analysts and industry sources said such a spree could hurt profit margins as the planemaker offers concessions to get deals across the line. The impact is not easy to gauge, however, since higher volumes also help jetmakers cut costs.

“Indigo is a sign of investors boxing up plane orders for airlines, but that’s not good for margins as it increases buyers’ power,” said Teal Group analyst Richard Aboulafia.

Another analyst, speaking on condition of anonymity because of company rules, said concessions need not involve price cuts.

Airbus sources said pricing was driven by the size of the deals and denied making unusual concessions.

Both Airbus and Boeing have deep pockets to offer discounts on best-selling narrowbody jets, where they make most profit. Both sides have accused the other of heavy discounting.

By contrast, it has been a poor year for orders of Airbus wide-body jets. With 46 orders so far, Airbus has been outsold more than three to one by Boeing, whose Dreamliner sales are at their highest since 2013.

Despite doubts over the future of the world’s largest airliner, the A380, Airbus still hopes to clinch an order for 36 from Dubai’s Emirates. Talks broke down at last month’s Dubai Airshow, but have since resumed, industry sources say.

That hasn’t prevented Airbus making contingency plans to phase out A380 output if the Emirates deal is abandoned, Reuters reported this week. Yet Airbus is also betting that if Emirates does buy, this will be a catalyst for other sales.

Airbus described the report as “speculation”.